Open Access. Powered by Scholars. Published by Universities.®

Astrophysics and Astronomy Commons

Open Access. Powered by Scholars. Published by Universities.®

7,539 Full-Text Articles 19,015 Authors 854,598 Downloads 192 Institutions

All Articles in Astrophysics and Astronomy

Faceted Search

7,539 full-text articles. Page 2 of 237.

Determining The Origins Of Helix Glitches In Ligo’S H1 Detector, Kara Shepard 2021 Andrews University

Determining The Origins Of Helix Glitches In Ligo’S H1 Detector, Kara Shepard

Honors Scholars & Undergraduate Research Poster Symposium Programs

The LIGO detectors are ultra-sensitive, making them susceptible to glitches from the noise that can block gravitational wave signals. In order to reduce the number of glitches that occur in the detector, the cause of the glitches must be found. I am researching the Helix glitch to try and determine its origin. This is accomplished by studying the times at which the glitch occurred in the detector and then looking for factors that may have caused a glitch to happen around the same time, to see if there are any correlations.


All-Sky Search In Early O3 Ligo Data For Continuous Gravitational-Wave Signals From Unknown Neutron Stars In Binary Systems, R. Abbott, T. D. Abbott, S. Abraham, F. Acernese, Teviet Creighton, Mario C. Diaz, Soma Mukherjee, Volker Quetschke, K. E. Ramirez, W. H. Wang 2021 The University of Texas Rio Grande Valley

All-Sky Search In Early O3 Ligo Data For Continuous Gravitational-Wave Signals From Unknown Neutron Stars In Binary Systems, R. Abbott, T. D. Abbott, S. Abraham, F. Acernese, Teviet Creighton, Mario C. Diaz, Soma Mukherjee, Volker Quetschke, K. E. Ramirez, W. H. Wang

Physics and Astronomy Faculty Publications and Presentations

Rapidly spinning neutron stars are promising sources of continuous gravitational waves. Detecting such a signal would allow probing of the physical properties of matter under extreme conditions. A significant fraction of the known pulsar population belongs to binary systems. Searching for unknown neutron stars in binary systems requires specialized algorithms to address unknown orbital frequency modulations. We present a search for continuous gravitational waves emitted by neutron stars in binary systems in early data from the third observing run of the Advanced LIGO and Advanced Virgo detectors using the semicoherent, GPU-accelerated, BinarySkyHough pipeline. The search analyzes the most sensitive frequency ...


Identifying, Analyzing, And Using Discriminatory Variables For Classification Of Neutrino Signal And Background Noise In Multivariate Analysis In The Askaryan Radio Array Experiment, Jesse Osborn 2021 University of Nebraska - Lincoln

Identifying, Analyzing, And Using Discriminatory Variables For Classification Of Neutrino Signal And Background Noise In Multivariate Analysis In The Askaryan Radio Array Experiment, Jesse Osborn

Honors Theses, University of Nebraska-Lincoln

The Askaryan Radio Array Experiment, located near the South Pole, works to pinpoint specific instances of neutrinos from outside the solar system interacting with nucleons inside the Antarctic ice, emitting radio waves. I have taken data from the ARA stations which is presumed to be background noise and compared it to simulated data meant to look like a neutrino signal. I developed a suite of variables for discrimination between the two data sets, using a computer algorithm to generate a single output variable which can be used to distinguish noise events from signal events. I maximized this discrimination process for ...


A Gravitational-Wave Measurement Of The Hubble Constant Following The Second Observing Run Of Advanced Ligo And Virgo, B. P. Abbott, R. Abbott, T. D. Abbott, S. Abraham, Teviet Creighton, Mario C. Diaz, Soma Mukherjee, Volker Quetschke, Malik Rakhmanov, K. E. Ramirez, Satzhan Sitmukhambetov, Robert Stone, D. Tuyenbayev, W. H. Wang, Adam Zadrozny 2021 The University of Texas Rio Grande Valley

A Gravitational-Wave Measurement Of The Hubble Constant Following The Second Observing Run Of Advanced Ligo And Virgo, B. P. Abbott, R. Abbott, T. D. Abbott, S. Abraham, Teviet Creighton, Mario C. Diaz, Soma Mukherjee, Volker Quetschke, Malik Rakhmanov, K. E. Ramirez, Satzhan Sitmukhambetov, Robert Stone, D. Tuyenbayev, W. H. Wang, Adam Zadrozny

Physics and Astronomy Faculty Publications and Presentations

This paper presents the gravitational-wave measurement of the Hubble constant (H0) using the detections from the first and second observing runs of the Advanced LIGO and Virgo detector network. The presence of the transient electromagnetic counterpart of the binary neutron star GW170817 led to the first standard-siren measurement of H0. Here we additionally use binary black hole detections in conjunction with galaxy catalogs and report a joint measurement. Our updated measurement is H0 = - 69+8 16 km s−1 Mpc−1 (68.3% of the highest density posterior interval with a flat-in-log prior) which is an improvement by a factor ...


A Nearby Transiting Rocky Exoplanet That Is Suitable For Atmospheric Investigation, T. Trifonov, J. A. Caballero, J. C. Morales, A. Seifahrt, I. Ribas, A. Reiners, J. L. Bean, R. Luque, H. Parviainen, E. Pallé, S. Stock, M. Zechmeister, P. J. Amado, G. Anglada-Escudé, M. Azzaro, T. Barclay, V. J. S. Béjar, P. Bluhm, N. Casasayas-Barris, C. Cifuentes, K. A. Collins, K. I. Collins, M. Cortés-Contreras, J. de Leon, S. Dreizler, C. D. Dressing, E. Esparza-Borges, N. Espinoza, M. Fausnaugh, A. Fukui, A. P. Hatzes, C. Hellier, T. Henning, C. E. Henze, E. Herrero, S. V. Jeffers, J. M. Jenkins, Eric L.N. Jensen, A. Kaminski, D. Kasper, D. Kossakowski, M. Kürster, M. Lafarga, D. W. Latham, A. W. Mann, K. Molaverdikhani, D. Montes, B. T. Montet, F. Murgas, N. Narita, M. Oshagh, V. M. Passegger, D. Pollacco, S. N. Quinn, A. Quirrenbach, G. R. Ricker, C. Rodríguez López, J. Sanz-Forcada, R. P. Schwarz, A. Schweitzer, S. Seager, A. Shporer, M. Stangret, J. Stürmer, T. G. Tan, P. Tenenbaum, J. D. Twicken, R. Vanderspek, J. N. Winn 2021 Swarthmore College

A Nearby Transiting Rocky Exoplanet That Is Suitable For Atmospheric Investigation, T. Trifonov, J. A. Caballero, J. C. Morales, A. Seifahrt, I. Ribas, A. Reiners, J. L. Bean, R. Luque, H. Parviainen, E. Pallé, S. Stock, M. Zechmeister, P. J. Amado, G. Anglada-Escudé, M. Azzaro, T. Barclay, V. J. S. Béjar, P. Bluhm, N. Casasayas-Barris, C. Cifuentes, K. A. Collins, K. I. Collins, M. Cortés-Contreras, J. De Leon, S. Dreizler, C. D. Dressing, E. Esparza-Borges, N. Espinoza, M. Fausnaugh, A. Fukui, A. P. Hatzes, C. Hellier, T. Henning, C. E. Henze, E. Herrero, S. V. Jeffers, J. M. Jenkins, Eric L.N. Jensen, A. Kaminski, D. Kasper, D. Kossakowski, M. Kürster, M. Lafarga, D. W. Latham, A. W. Mann, K. Molaverdikhani, D. Montes, B. T. Montet, F. Murgas, N. Narita, M. Oshagh, V. M. Passegger, D. Pollacco, S. N. Quinn, A. Quirrenbach, G. R. Ricker, C. Rodríguez López, J. Sanz-Forcada, R. P. Schwarz, A. Schweitzer, S. Seager, A. Shporer, M. Stangret, J. Stürmer, T. G. Tan, P. Tenenbaum, J. D. Twicken, R. Vanderspek, J. N. Winn

Physics & Astronomy Faculty Works

Spectroscopy of transiting exoplanets can be used to investigate their atmospheric properties and habitability. Combining radial velocity (RV) and transit data provides additional information on exoplanet physical properties. We detect a transiting rocky planet with an orbital period of 1.467 days around the nearby red dwarf star Gliese 486. The planet Gliese 486 b is 2.81 Earth masses and 1.31 Earth radii, with uncertainties of 5%, as determined from RV data and photometric light curves. The host star is at a distance of ~8.1 parsecs, has a J-band magnitude of ~7.2, and is observable from ...


Redefining Nietzsche’S Greatest Weight Into Contemporary Cosmology, Christian E. Coffinet-Crean 2021 University of Minnesota Morris

Redefining Nietzsche’S Greatest Weight Into Contemporary Cosmology, Christian E. Coffinet-Crean

Scholarly Horizons: University of Minnesota, Morris Undergraduate Journal

Friedrich Nietzsche’s theory of eternal recurrence and it’s cosmological value has been discredited and cast aside because of the lack of scientific backing the original theory had. In this essay, Nietzche’s eternal recurrence will be observed and analyzed through some of his major works and defended from outside criticism. Furthermore, Roger Penrose’s Conformal Cyclic Cosmology and Jean-Paul Luminet’s research are used in support for eternal recurrence as a cosmological theory. Luminet’s research of cosmic background radiation concludes that the universe has an odd but finite shape. Penrose’s research theorizes a sort of repeating ...


How And Why Mars Lost Its Water, Sana Akhter, Andre Beikircher 2021 College of DuPage

How And Why Mars Lost Its Water, Sana Akhter, Andre Beikircher

2021 Honors Council of the Illinois Region

The topic of this paper is to investigate how and why Mars lost its water. It is important to study the loss of water on Mars because it can give us a better understanding of how Mars once looked, if life were possible, and how it could have changed so drastically to what it is now. The paper aims to address which factors led to Mars losing its water and how long ago this happened. Using our data, we will predict how quickly Mars’ core cooled, when its magnetic field weakened, and when the water was lost. We learned that ...


Quasinormal Modes And Their Overtones At The Common Horizon In A Binary Black Hole Merger, Pierre Mourier, Xisco Jimenez Forteza, Daniel Pook-Kolb, Dadri Krishnan, Erik Schnetter 2021 Max Planck Inst Gravitat Phys, Albert Einstein Inst, Callinstr 38, D-30167 Hannover, Germany, Leibniz Univ Hannover, D-30167 Hannover, Germany

Quasinormal Modes And Their Overtones At The Common Horizon In A Binary Black Hole Merger, Pierre Mourier, Xisco Jimenez Forteza, Daniel Pook-Kolb, Dadri Krishnan, Erik Schnetter

Faculty Publications

It is expected that all astrophysical black holes in equilibrium are well described by the Kerr solution. Moreover, any black hole far away from equilibrium, such as one initially formed in a compact binary merger or by the collapse of a massive star, will eventually reach a final equilibrium Kerr state. At sufficiently late times in this process of reaching equilibrium, we expect that the black hole is modeled as a perturbation around the final state. The emitted gravitational waves will then be damped sinusoids with frequencies and damping times given by the quasinormal mode spectrum of the final Kerr ...


Extending The Frequency Reach Of Pulsar Timing Array Based Gravitational Wave Search Without High Cadence Observations, Yan Wang, Soumya Mohanty, Zhoujian Cao 2021 The University of Texas Rio Grande Valley

Extending The Frequency Reach Of Pulsar Timing Array Based Gravitational Wave Search Without High Cadence Observations, Yan Wang, Soumya Mohanty, Zhoujian Cao

Physics and Astronomy Faculty Publications and Presentations

Gravitational wave (GW) searches using pulsar timing arrays (PTAs) are assumed to be limited by the typical average observational cadence of 1/(2 weeks) for a single pulsar to GW frequencies . 4 × 10−7 Hz. We show that this assumption is incorrect and that a PTA can detect signals with much higher frequencies, which are preserved in the data due to aliasing, by exploiting asynchronous observations from multiple pulsars. This allows an observation strategy that is scalable to future large-scale PTAs containing O(103) pulsars, enabled by the Five-hundred meter Aperture Spherical Telescope and the Square Kilometer Array, without requiring ...


Scalable, Cost-Efficient Synthesis And Properties Optimization Of Magnetoelectric Cobalt Ferrite/Barium Titanate Composites, Farnaz Safi Samghabadi, Long Chang, Mohammad Khodadadi, Karen S. Martirosyan, Dmitri Litvinov 2021 The University of Texas Rio Grande Valley

Scalable, Cost-Efficient Synthesis And Properties Optimization Of Magnetoelectric Cobalt Ferrite/Barium Titanate Composites, Farnaz Safi Samghabadi, Long Chang, Mohammad Khodadadi, Karen S. Martirosyan, Dmitri Litvinov

Physics and Astronomy Faculty Publications and Presentations

Cobalt ferrite (CoFe2O4)/barium titanate (BaTiO3) particulate composites exhibiting high magnetoelectric coefficients were synthesized from low-cost commercial precursors using mechanical ball milling followed by high-temperature annealing. CoFe2O4 (20 nm–50 nm) and either cubic or tetragonal BaTiO3 nanoparticle powders were used for the synthesis. It was found that utilizing a 50nm cubic BaTiO3 powder as a precursor results in a composite with a magnetoelectric coupling coefficient value as high as 4.3 mV/Oe cm, which is comparable to those of chemically synthesized core–shell CoFe2O4–BaTiO3 nanoparticles. The microstructure of these composites is dramatically different from the composite synthesized ...


Scalable, Cost-Efficient Synthesis And Properties Optimization Of Magnetoelectric Cobalt Ferrite/Barium Titanate Composites, Farnaz Safi Samghabadi, Long Chang, Mohammad Khodadadi, Karen S. Martirosyan, Dmitri Litvinov 2021 The University of Texas Rio Grande Valley

Scalable, Cost-Efficient Synthesis And Properties Optimization Of Magnetoelectric Cobalt Ferrite/Barium Titanate Composites, Farnaz Safi Samghabadi, Long Chang, Mohammad Khodadadi, Karen S. Martirosyan, Dmitri Litvinov

Physics and Astronomy Faculty Publications and Presentations

Cobalt ferrite (CoFe2O4)/barium titanate (BaTiO3) particulate composites exhibiting high magnetoelectric coefficients were synthesized from low-cost commercial precursors using mechanical ball milling followed by high-temperature annealing. CoFe2O4 (20 nm–50 nm) and either cubic or tetragonal BaTiO3 nanoparticle powders were used for the synthesis. It was found that utilizing a 50nm cubic BaTiO3 powder as a precursor results in a composite with a magnetoelectric coupling coefficient value as high as 4.3 mV/Oe cm, which is comparable to those of chemically synthesized core–shell CoFe2O4–BaTiO3 nanoparticles. The microstructure of these composites is dramatically different from the composite synthesized ...


Identification Of A Local Sample Of Gamma-Ray Bursts Consistent With A Magnetar Giant Flare Origin, E. Burns, D. Svinkin, K Hurley, Z. Wadiasingh, M. Negro, G. Younes, R. Hamburg, A. Ridnaia, D. Cook, S. B. Cenko, R. Aloisi, G. Ashton, M. Baring, M. S. Briggs, N. Christensen, D. Frederiks, A. Goldstein, C. M. Hui, D. L. Kaplan, M. M. Kasliwal, D. Kocevski, O. J. Roberts, V. Savchenko, A. Tohuvavohu, P. Veres, C. A. Wilson-Hodge 2021 Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

Identification Of A Local Sample Of Gamma-Ray Bursts Consistent With A Magnetar Giant Flare Origin, E. Burns, D. Svinkin, K Hurley, Z. Wadiasingh, M. Negro, G. Younes, R. Hamburg, A. Ridnaia, D. Cook, S. B. Cenko, R. Aloisi, G. Ashton, M. Baring, M. S. Briggs, N. Christensen, D. Frederiks, A. Goldstein, C. M. Hui, D. L. Kaplan, M. M. Kasliwal, D. Kocevski, O. J. Roberts, V. Savchenko, A. Tohuvavohu, P. Veres, C. A. Wilson-Hodge

Faculty Publications

Cosmological gamma-ray bursts (GRBs) are known to arise from distinct progenitor channels: short GRBs mostly from neutron star mergers and long GRBs from a rare type of core-collapse supernova (CCSN) called collapsars. Highly magnetized neutron stars called magnetars also generate energetic, short-duration gamma-ray transients called magnetar giant flares (MGFs). Three have been observed from the Milky Way and its satellite galaxies, and they have long been suspected to constitute a third class of extragalactic GRBs. We report the unambiguous identification of a distinct population of four local (<5 Mpc) short GRBs, adding GRB 070222 to previously discussed events. While identified solely based on alignment with nearby star-forming galaxies, their rise time and isotropic energy release are independently inconsistent with the larger short GRB population at >99.9% confidence. These properties, the host galaxies, and nondetection in gravitational waves ...


Tess Discovery Of A Super-Earth And Three Sub-Neptunes Hosted By The Bright, Sun-Like Star Hd 108236, T. Daylan, K. Pinglé, J. Wright, M. N. Günther, K. G. Stassun, S. R. Kane, A. Vanderburg, D. Jontof-Hutter, J. E. Rodriguez, A. Shporer, C. X. Huang, T. Mikal-Evans, M. Badenas-Agusti, K. A. Collins, B. V. Rackham, S. N. Quinn, R. Cloutier, K. I. Collins, P. Guerra, Eric L.N. Jensen, J. F. Kielkopf, B. Massey, R. P. Schwarz, D. Charbonneau, J. J. Lissauer, J. M. Irwin, Ö Baştürk, B. Fulton, A. Soubkiou, B. Zouhair, S. B. Howell, C. Ziegler, C. Briceño, N. Law, A. W. Mann, N. Scott, E. Furlan, D. R. Ciardi, R. Matson, C. Hellier, D. R. Anderson, R. P. Butler, J. D. Crane, J. K. Teske, S. A. Shectman, M. H. Kristiansen, I. A. Terentev, H. M. Schwengeler, G. R. Ricker, R. Vanderspek, S. Seager, J. N. Winn, J. M. Jenkins, Z. K. Berta-Thompson, L. G. Bouma, W. Fong, G. Furesz, C. E. Henze, E. H. Morgan, E. Quintana, E. B. Ting, J. D. Twicken 2021 Swarthmore College

Tess Discovery Of A Super-Earth And Three Sub-Neptunes Hosted By The Bright, Sun-Like Star Hd 108236, T. Daylan, K. Pinglé, J. Wright, M. N. Günther, K. G. Stassun, S. R. Kane, A. Vanderburg, D. Jontof-Hutter, J. E. Rodriguez, A. Shporer, C. X. Huang, T. Mikal-Evans, M. Badenas-Agusti, K. A. Collins, B. V. Rackham, S. N. Quinn, R. Cloutier, K. I. Collins, P. Guerra, Eric L.N. Jensen, J. F. Kielkopf, B. Massey, R. P. Schwarz, D. Charbonneau, J. J. Lissauer, J. M. Irwin, Ö Baştürk, B. Fulton, A. Soubkiou, B. Zouhair, S. B. Howell, C. Ziegler, C. Briceño, N. Law, A. W. Mann, N. Scott, E. Furlan, D. R. Ciardi, R. Matson, C. Hellier, D. R. Anderson, R. P. Butler, J. D. Crane, J. K. Teske, S. A. Shectman, M. H. Kristiansen, I. A. Terentev, H. M. Schwengeler, G. R. Ricker, R. Vanderspek, S. Seager, J. N. Winn, J. M. Jenkins, Z. K. Berta-Thompson, L. G. Bouma, W. Fong, G. Furesz, C. E. Henze, E. H. Morgan, E. Quintana, E. B. Ting, J. D. Twicken

Physics & Astronomy Faculty Works

We report the discovery and validation of four extrasolar planets hosted by the nearby, bright, Sun-like (G3V) star HD 108236 using data from the Transiting Exoplanet Survey Satellite (TESS). We present transit photometry, reconnaissance, and precise Doppler spectroscopy, as well as high-resolution imaging, to validate the planetary nature of the objects transiting HD 108236, also known as the TESS Object of Interest (TOI) 1233. The innermost planet is a possibly rocky super-Earth with a period of ${3.79523}_{-0.00044}^{+0.00047}$days and has a radius of 1.586 ± 0.098 R⊕. The outer planets are sub-Neptunes, with ...


Tess Hunt For Young And Maturing Exoplanets (Thyme). Iv. Three Small Planets Orbiting A 120 Myr Old Star In The Pisces–Eridanus Stream, E. R. Newton, A. W. Mann, A. L. Kraus, J. H. Livingston, A. Vanderburg, J. L. Curtis, P. C. Thao, K. Hawkins, M. L. Wood, A. C. Rizzuto, A. Soubkiou, B. M. Tofflemire, G. Zhou, I. J. M. Crossfield, L. A. Pearce, K. A. Collins, D. M. Conti, T.-G. Tan, S. Villanueva, A. Spencer, D. Dragomir, S. M. Quinn, Eric L.N. Jensen, K. I. Collins, C. Stockdale, R. Cloutier, C. Hellier, Z. Benkhaldoun, C. Ziegler, C. Briceño, N. Law, B. Benneke, J. L. Christiansen, V. Gorjian, S. R. Kane, L. Kreidberg, F. Y. Morales, M. W. Werner, J. D. Twicken, A. M. Levine, D. R. Ciardi, N. M. Guerrero, K. Hesse, E. V. Quintana, B. Shiao, J. C. Smith, G. Torres, G. R. Ricker, R. Vanderspek, S. Seager, J. N. Winn, J. M. Jenkins, D. W. Latham 2021 Swarthmore College

Tess Hunt For Young And Maturing Exoplanets (Thyme). Iv. Three Small Planets Orbiting A 120 Myr Old Star In The Pisces–Eridanus Stream, E. R. Newton, A. W. Mann, A. L. Kraus, J. H. Livingston, A. Vanderburg, J. L. Curtis, P. C. Thao, K. Hawkins, M. L. Wood, A. C. Rizzuto, A. Soubkiou, B. M. Tofflemire, G. Zhou, I. J. M. Crossfield, L. A. Pearce, K. A. Collins, D. M. Conti, T.-G. Tan, S. Villanueva, A. Spencer, D. Dragomir, S. M. Quinn, Eric L.N. Jensen, K. I. Collins, C. Stockdale, R. Cloutier, C. Hellier, Z. Benkhaldoun, C. Ziegler, C. Briceño, N. Law, B. Benneke, J. L. Christiansen, V. Gorjian, S. R. Kane, L. Kreidberg, F. Y. Morales, M. W. Werner, J. D. Twicken, A. M. Levine, D. R. Ciardi, N. M. Guerrero, K. Hesse, E. V. Quintana, B. Shiao, J. C. Smith, G. Torres, G. R. Ricker, R. Vanderspek, S. Seager, J. N. Winn, J. M. Jenkins, D. W. Latham

Physics & Astronomy Faculty Works

Young exoplanets can offer insight into the evolution of planetary atmospheres, compositions, and architectures. We present the discovery of the young planetary system TOI 451 (TIC 257605131, Gaia DR2 4844691297067063424). TOI 451 is a member of the 120 Myr old Pisces–Eridanus stream (Psc–Eri). We confirm membership in the stream with its kinematics, its lithium abundance, and the rotation and UV excesses of both TOI 451 and its wide-binary companion, TOI 451 B (itself likely an M-dwarf binary). We identified three candidate planets transiting in the Transiting Exoplanet Survey Satellite data and followed up the signals with photometry from ...


The Tess-Keck Survey. Ii. An Ultra-Short-Period Rocky Planet And Its Siblings Transiting The Galactic Thick-Disk Star Toi-561, L. M. Weiss, F. Dai, D. Huber, J. M. Brewer, K. A. Collins, D. R. Ciardi, E. C. Matthews, C. Ziegler, S. B. Howell, N. M. Batalha, I. J. M. Crossfield, C. Dressing, B. Fulton, A. W. Howard, H. Isaacson, S. R. Kane, E. A. Petigura, P. Robertson, A. Roy, R. A. Rubenzahl, J. D. Twicken, Z. R. Claytor, K. G. Stassun, M. G. MacDougall, A. Chontos, S. Giacalone, P. A. Dalba, T. Mocnik, M. L. Hill, C. Beard, J. M. Akana Murphy, L. J. Rosenthal, A. Behmard, J. Van Zandt, J. Lubin, M. R. Kosiarek, M. B. Lund, J. L. Christiansen, R. A. Matson, C. A. Beichman, J. E. Schlieder, E. J. Gonzales, C. Briceño, N. Law, A. W. Mann, K. I. Collins, P. Evans, A. Fukui, Eric L.N. Jensen, F. Murgas, N. Narita, E. Palle, H. Parviainen, R. P. Schwarz, T.-G. Tan, J. S. Acton, P. Eigmüller, J. Jenkins, G. Ricker, S. Seager, J. N. Winn 2021 Swarthmore College

The Tess-Keck Survey. Ii. An Ultra-Short-Period Rocky Planet And Its Siblings Transiting The Galactic Thick-Disk Star Toi-561, L. M. Weiss, F. Dai, D. Huber, J. M. Brewer, K. A. Collins, D. R. Ciardi, E. C. Matthews, C. Ziegler, S. B. Howell, N. M. Batalha, I. J. M. Crossfield, C. Dressing, B. Fulton, A. W. Howard, H. Isaacson, S. R. Kane, E. A. Petigura, P. Robertson, A. Roy, R. A. Rubenzahl, J. D. Twicken, Z. R. Claytor, K. G. Stassun, M. G. Macdougall, A. Chontos, S. Giacalone, P. A. Dalba, T. Mocnik, M. L. Hill, C. Beard, J. M. Akana Murphy, L. J. Rosenthal, A. Behmard, J. Van Zandt, J. Lubin, M. R. Kosiarek, M. B. Lund, J. L. Christiansen, R. A. Matson, C. A. Beichman, J. E. Schlieder, E. J. Gonzales, C. Briceño, N. Law, A. W. Mann, K. I. Collins, P. Evans, A. Fukui, Eric L.N. Jensen, F. Murgas, N. Narita, E. Palle, H. Parviainen, R. P. Schwarz, T.-G. Tan, J. S. Acton, P. Eigmüller, J. Jenkins, G. Ricker, S. Seager, J. N. Winn

Physics & Astronomy Faculty Works

We report the discovery of TOI-561, a multiplanet system in the galactic thick disk that contains a rocky, ultra-short-period planet. This bright (V = 10.2) star hosts three small transiting planets identified in photometry from the NASA TESS mission: TOI-561 b (TOI-561.02, P = 0.44 days, Rp = 1.45 ± 0.11 R⊕), c (TOI-561.01, P = 10.8 days, Rp = 2.90 ± 0.13 R⊕), and d (TOI-561.03, P = 16.3 days, Rp = 2.32 ± 0.16 R⊕). The star is chemically ([Fe/H] = −0.41 ± 0.05, [α/Fe] = +0.23 ± 0.05) and kinematically consistent with ...


Toi-954 B And K2-329 B: Short-Period Saturn-Mass Planets That Test Whether Irradiation Leads To Inflation, L. Sha, C. X. Huang, A. Shporer, J. E. Rodriguez, A. Vanderburg, R. Brahm, J. Hagelberg, E. C. Matthews, C. Ziegler, J. H. Livingston, K. G. Stassun, D. J. Wright, J. D. Crane, N. Espinoza, F. Bouchy, G. Á. Bakos, K. A. Collins, G. Zhou, A. Bieryla, J. D. Hartman, R. A. Wittenmyer, L. D. Nielsen, P. Plavchan, D. Bayliss, P. Sarkis, T.-G. Tan, R. Cloutier, L. Mancini, A. Jordán, S. Wang, T. Henning, N. Narita, K. Penev, J. K. Teske, S. R. Kane, A. W. Mann, B. C. Addison, M. Tamura, J. Horner, M. Barbieri, J. A. Burt, M. R. Díaz, I. J. M. Crossfield, D. Dragomir, H. Drass, A. D. Feinstein, H. Zhang, R. Hart, J. F. Kielkopf, Eric L.N. Jensen, B. T. Montet, G. Ottoni, R. P. Schwarz, F. Rojas, D. Nespral, P. Torres, M. W. Mengel, S. Udry, A. Zapata, E. Snoddy, J. Okumura, G. R. Ricker, R. K. Vanderspek, D. W. Latham, J. N. Winn, S. Seager, J. M. Jenkins, K. D. Colón, C. E. Henze, A. Krishnamurthy, E. B. Ting, M. Vezie, S. Villanueva 2021 Swarthmore College

Toi-954 B And K2-329 B: Short-Period Saturn-Mass Planets That Test Whether Irradiation Leads To Inflation, L. Sha, C. X. Huang, A. Shporer, J. E. Rodriguez, A. Vanderburg, R. Brahm, J. Hagelberg, E. C. Matthews, C. Ziegler, J. H. Livingston, K. G. Stassun, D. J. Wright, J. D. Crane, N. Espinoza, F. Bouchy, G. Á. Bakos, K. A. Collins, G. Zhou, A. Bieryla, J. D. Hartman, R. A. Wittenmyer, L. D. Nielsen, P. Plavchan, D. Bayliss, P. Sarkis, T.-G. Tan, R. Cloutier, L. Mancini, A. Jordán, S. Wang, T. Henning, N. Narita, K. Penev, J. K. Teske, S. R. Kane, A. W. Mann, B. C. Addison, M. Tamura, J. Horner, M. Barbieri, J. A. Burt, M. R. Díaz, I. J. M. Crossfield, D. Dragomir, H. Drass, A. D. Feinstein, H. Zhang, R. Hart, J. F. Kielkopf, Eric L.N. Jensen, B. T. Montet, G. Ottoni, R. P. Schwarz, F. Rojas, D. Nespral, P. Torres, M. W. Mengel, S. Udry, A. Zapata, E. Snoddy, J. Okumura, G. R. Ricker, R. K. Vanderspek, D. W. Latham, J. N. Winn, S. Seager, J. M. Jenkins, K. D. Colón, C. E. Henze, A. Krishnamurthy, E. B. Ting, M. Vezie, S. Villanueva

Physics & Astronomy Faculty Works

We report the discovery of two short-period Saturn-mass planets, one transiting the G subgiant TOI-954 (TIC 44792534, V = 10.343, T = 9.78) observed in TESS sectors 4 and 5 and one transiting the G dwarf K2-329 (EPIC 246193072, V = 12.70, K = 10.67) observed in K2 campaigns 12 and 19. We confirm and characterize these two planets with a variety of ground-based archival and follow-up observations, including photometry, reconnaissance spectroscopy, precise radial velocity, and high-resolution imaging. Combining all available data, we find that TOI-954 b has a radius of ${0.852}_{-0.062}^{+0.053}\,{R}_ ...


Galaxy And Mass Assembly: Group And Field Galaxy Morphologies In The Star-Formation Rate - Stellar Mass Plane, W. J. Pearson, L. Wang, S. Brough, Benne Holwerda, A. M. Hopkins, J. Loveday 2021 National Centre for Nuclear Research

Galaxy And Mass Assembly: Group And Field Galaxy Morphologies In The Star-Formation Rate - Stellar Mass Plane, W. J. Pearson, L. Wang, S. Brough, Benne Holwerda, A. M. Hopkins, J. Loveday

Faculty Scholarship

Aims. We study the environment in which a galaxy lies (i.e. field or group) and its connection with the morphology of the galaxy. This is done by examining the distribution of parametric and non-parametric statistics across the star-formation rate (SFR) - stellar mass (M?) plane and studying how these distributions change with the environment in the local universe (z < 0.15). Methods. We determine the concentration (C), Gini, M20, asymmetry, Gini-M20 bulge statistic (GMB), 50% light radius (r50), total Sérsic index, and bulge Sérsic index (nBulge) for galaxies from the Galaxy and Mass Assembly (GAMA) survey using optical images from the Kilo Degree Survey. We determine the galaxy environment using the GAMA group catalogue and split the galaxies into field or group galaxies. The group galaxies are further divided by the group halo mass (Mh) - 11 ≤ log(Mh /M*) < 12, 12 ≤ log(Mh /M*) < 13, and 13 ≤ log(Mh /M*) < 14 - and into central and satellite galaxies. The galaxies in each of these samples are then placed onto the SFR-M? plane, and each parameter is used as a third dimension. We fit the resulting distributions for each parameter in each sample using two two-dimensional Gaussian distributions: one for star-forming galaxies and one for quiescent galaxies. The coefficients of these Gaussian fits are then compared between environments. Results. Using C and r50, we find that galaxies typically become larger as the group mass increases. This change is greater for larger galaxies. There is no indication that galaxies are typically more or less clumpy as the environment changes. Using GMB and nBulge , we see that the star-forming galaxies do not become more bulge or disk dominated as the group mass changes. Asymmetry does not appear to be greatly influenced by environment.


Concentrated Lunar Resources: Imminent Implications For Governance And Justice, Martin Elvis, Alanna Krolikowski, Tony Milligan 2021 Missouri University of Science and Technology

Concentrated Lunar Resources: Imminent Implications For Governance And Justice, Martin Elvis, Alanna Krolikowski, Tony Milligan

History and Political Science Faculty Research & Creative Works

Numerous missions planned for the next decade are likely to target a handful of small sites of interest on the Moon's surface, creating risks of crowding and interference at these locations. The Moon presents finite and scarce areas with rare topography or concentrations of resources of special value. Locations of interest to science, notably for astronomy, include the Peaks of Eternal Light, the coldest of the cold traps and smooth areas on the far side. Regions richest in physical resources could also be uniquely suited to settlement and commerce. Such sites of interest are both few and small. Typically ...


Galaxy And Mass Assembly (Gama): The Interplay Between Galaxy Mass, Sfr, And Heavy Element Abundance In Paired Galaxy Sets, L. E. Garduno, M. A. Lara-Lopez, O. Lopez-Cruz, A. M. Hopkins, M. S. Owers, K. A. Pimbblet, Benne Holwerda 2021 Instituto Nacional de Astrofısica

Galaxy And Mass Assembly (Gama): The Interplay Between Galaxy Mass, Sfr, And Heavy Element Abundance In Paired Galaxy Sets, L. E. Garduno, M. A. Lara-Lopez, O. Lopez-Cruz, A. M. Hopkins, M. S. Owers, K. A. Pimbblet, Benne Holwerda

Faculty Scholarship

We study the star formation rate (SFR), stellar mass (M), and the gas metallicity (Z) for 4636 galaxy pairs using the Galaxy And Mass Assembly (GAMA) survey. Our galaxy pairs lie in a redshift range of 0


A Multi-Wavelength Study Of The Disk Winds And Their Role In The Agn Studies, Maryam Dehghanian 2021 University of Kentucky

A Multi-Wavelength Study Of The Disk Winds And Their Role In The Agn Studies, Maryam Dehghanian

Theses and Dissertations--Physics and Astronomy

Active galactic nuclei (AGNs) are located at the centers of massive galaxies and are the most luminous objects in the universe. Each AGN embeds a super-massive black hole which produces outflows of gas, or winds. These winds are important because they provide a reasonable physical basis for the connections between the black hole and the properties of their host galaxy. While AGNs have been extensively studied, several fundamental questions about them are yet to be answered. These include the structure and dynamics of the central source and their winds, and questions regarding the evolution of these galaxies.

NGC 5548 is ...


Digital Commons powered by bepress