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# Astrophysics and Astronomy Commons™

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7,172 Full-Text Articles 17,615 Authors 485,246 Downloads 190 Institutions

## All Articles in Astrophysics and Astronomy

7,172 full-text articles. Page 2 of 222.

Extended Gamma Analysis Of Snr G330.2 + 1.0, 2020 University of North Florida

#### Extended Gamma Analysis Of Snr G330.2 + 1.0, Abagael Barba

##### Showcase of Osprey Advancements in Research and Scholarship (SOARS)

Analyzing gamma rays is an important aspect of modern astronomy and astrophysics, for they are the most powerful bands of energy on the electromagnetic spectrum. Comprehending gamma rays allows for deeper understanding of countless phenomena within our universe, such as cosmic rays. Cosmic rays are high energy particles thought to be formed via extremely violent explosions within our universe. These accelerated particles mirror conditions present in a supernova. A supernova is what occurs when a star at least 8 times as massive as our sun reaches the end of its lifespan and bursts. These explosions are the most powerful events ...

Death Line For Radio Pulsars In Braneworlds, 2020 Ulugh Beg Astronomical Institute

#### Death Line For Radio Pulsars In Braneworlds, Djavlanbek Rayimbaev, Satimbay Palvanov, Maksud Umaraliyev, Malika Khudoyberdiyeva

##### Bulletin of National University of Uzbekistan: Mathematics and Natural Sciences

We investigate the effects of braneworlds on energetic processes in plasma. magnetosphere of neutron stars. Obtained that the presence of brane charge causes an increase in the size of the polar cap region. It has shown that the polar capsize of neutron stars with larger rotation period and compactness parameter is also larger. We have studied deathline of radio pulsar in braneworld. Obtained that the deathline shifted down and the pulsars which lying on the deathline become visible in radio band. Moreover, we have extended particle acceleration in polar cap of neutron stars in the presence of the brane charge ...

Lhs 1815b: The First Thick-Disk Planet Detected By Tess, 2020 Swarthmore College

#### Lhs 1815b: The First Thick-Disk Planet Detected By Tess, T. Gan, A. Shporer, J. H. Livingston, K. A. Collins, S. Mao, A. A. Trani, D. Gandolfi, T. Hirano, R. Luque, K. G. Stassun, C. Ziegler, S. B. Howell, C. Hellier, J. M. Irwin, J. G. Winters, D. R. Anderson, C. Briceño, N. Law, A. W. Mann, X. Bonfils, N. Astudillo-Defru, Eric L.N. Jensen, G. Anglada-Escudé, G. R. Ricker, R. Vanderspek, D. W. Latham, S. Seager, J. N. Winn, J. M. Jenkins, G. Furesz, N. M. Guerrero, E. Quintana, J. D. Twicken, D. A. Caldwell, P. Tenenbaum, C. X. Huang, P. Rowden, B. Rojas-Ayala

##### Physics & Astronomy Faculty Works

We report the first discovery of a thick-disk planet, LHS 1815b (TOI-704b, TIC 260004324), detected in the Transiting Exoplanet Survey Satellite (TESS) survey. LHS 1815b transits a bright (V = 12.19 mag, K = 7.99 mag) and quiet M dwarf located 29.87 ± 0.02 pc away with a mass of 0.502 ± 0.015 M and a radius of 0.501 ± 0.030 R . We validate the planet by combining space- and ground-based photometry, spectroscopy, and imaging. The planet has a radius of 1.088 ± 0.064 R with a 3σ mass upper limit of 8.7 M . We ...

In-Class Activities For Openstax Astronomy, 2020 Columbus State University

#### In-Class Activities For Openstax Astronomy, Rosa Williams, Kimberly Shaw

##### Physics and Astronomy Ancillary Materials

This set of in-class activities in Microsoft Word format are intended to supplement OpenStax Astronomy. Topics include:

• Atmospheric Gas
• Celestial Sphere
• Dwarf Planets
• Earth Size
• Earth Impact
• Greenhouse Gases and Climate Change
• Jovian Planet
• Jovian Moon and Ring
• Mars Atmosphere and Climate
• Solar System Formation and Scale
• Sunspots
• Terrestrial Planet and Lunar Features
• Venus Atmosphere and Climate

2020 University of Texas at San Antonio

#### Towards A Real-Time Fully-Coherent All-Sky Search For Gravitational Waves From Compact Binary Coalescences Using Particle Swarm Optimization, M. E. Normandin, Soumya Mohanty

##### Physics and Astronomy Faculty Publications and Presentations

While a fully-coherent all-sky search is known to be optimal for detecting gravitational wave signals from compact binary coalescences, its high computational cost has limited current searches to less sensitive coincidence-based schemes. Following up on previous work that has demonstrated the effectiveness of particle swarm optimization (PSO) in reducing the computational cost of this search, we present an implementation that achieves near real-time computational speed. This is achieved by combining the search efficiency of PSO with a significantly revised and optimized numerical implementation of the underlying mathematical formalism along with additional multithreaded parallelization layers in a distributed computing framework. For ...

Star Formation In Low-Redshift Cluster Dwarf Galaxies, 2020 University of North Dakota

#### Star Formation In Low-Redshift Cluster Dwarf Galaxies, Cody M. Rude, Madina R. Sultanova, Gihan L. Ipita Kaduwa Gamage, Wayne A. Barkhouse, Sandanuwan P. Kalawila Vithanage

##### Physics Faculty Publications

Evolution of galaxies in dense environments can be affected by close encounters with neighbouring galaxies and interactions with the intracluster medium. Dwarf galaxies (dGs) are important as their low mass makes them more susceptible to these effects than giant systems. Combined luminosity functions (LFs) in the r and u band of 15 galaxy clusters were constructed using archival data from the Canada–France–Hawaii Telescope. LFs were measured as a function of clustercentric radius from stacked cluster data. Marginal evidence was found for an increase in the faint-end slope of the u-band LF relative to the r-band with ...

Tess Spots A Hot Jupiter With An Inner Transiting Neptune, 2020 Swarthmore College

#### Tess Spots A Hot Jupiter With An Inner Transiting Neptune, C. X. Huang, S. N. Quinn, A. Vanderburg, J. Becker, J. E. Rodriguez, F. J. Pozuelos, D. Gandolfi, G. Zhou, A. W. Mann, K. A. Collins, I. Crossfield, K. Barkaoui, K. I. Collins, M. Fridlund, M. Gillon, E. J. Gonzales, M. N. Günther, T. J. Henry, S. B. Howell, H.-S. James, W.-C. Jao, E. Jehin, Eric L.N. Jensen, S. R. Kane, J. J. Lissauer, E. Matthews, R. A. Matson, L. A. Paredes, J. E. Schlieder, K. G. Stassun, A. Shporer, L. Sha, T.-G. Tan, I. Georgieva, S. Mathur, E. Palle, C. M. Persson, V. Van Eylen, G. R. Ricker, R. K. Vanderspek, D. W. Latham, J. N. Winn, S. Seager, J. M. Jenkins, C. J. Burke, R. F. Goeke, S. Rinehart, M. E. Rose, E. B. Ting, G. Torres, I. Wong

##### Physics & Astronomy Faculty Works

Hot Jupiters are rarely accompanied by other planets within a factor of a few in orbital distance. Previously, only two such systems have been found. Here, we report the discovery of a third system using data from the Transiting Exoplanet Survey Satellite (TESS). The host star, TOI-1130, is an eleventh magnitude K-dwarf in Gaia G-band. It has two transiting planets: a Neptune-sized planet (3.65 ± 0.10 ${R}_{\oplus }$) with a 4.1 days period, and a hot Jupiter (${1.50}_{-0.22}^{+0.27}$ ${R}_{{\rm{J}}}$) with an 8.4 days period. Precise radial-velocity observations ...

Toi-132 B: A Short-Period Planet In The Neptune Desert Transiting A V = 11.3 G-Type Star, 2020 Swarthmore College

#### Toi-132 B: A Short-Period Planet In The Neptune Desert Transiting A V = 11.3 G-Type Star, M. R. Díaz, J. S. Jenkins, D. Gandolfi, E. D. Lopez, M. G. Soto, P. Cortés-Zuleta, Z. M. Berdiñas, K. G. Stassun, K. A. Collins, J. I. Vines, C. Ziegler, M. Fridlund, Eric L.N. Jensen, F. Murgas, A. Santerne, P. A. Wilson, M. Esposito, A. P. Hatzes, M. C. Johnson, K. W. F. Lam, J. H. Livingston, V. Van Eylen, N. Narita, C. Briceño, K. I. Collins, S. Csizmadia, M. Fausnaugh, T. Gan, R. A. García, I. Georgieva, A. Glidden, L. González-Cuesta, J. M. Jenkins, D. W. Latham, N. M. Law, A. W. Mann, S. Mathur, I. Mireles, R. Morris, E. Pallé, C. M. Persson, G. Ricker, S. Rinehart, M. E. Rose, S. Seager, J. C. Smith, T.-G. Tan, A. Tokovinin, A. Vanderburg, R. Vanderspek, J. N. Winn, D. A. Yahalomi

##### Physics & Astronomy Faculty Works

The Neptune desert is a feature seen in the radius-period plane, whereby a notable dearth of short period, Neptune-like planets is found. Here, we report the Transiting Exoplanet Survey Satellite (TESS) discovery of a new short-period planet in the Neptune desert, orbiting the G-type dwarf TYC 8003-1117-1 (TOI-132). TESS photometry shows transit-like dips at the level of ∼1400 ppm occurring every ∼2.11 d. High-precision radial velocity follow-up with High Accuracy Radial Velocity Planet Searcher confirmed the planetary nature of the transit signal and provided a semi-amplitude radial velocity variation of 11.38 +0.84−0.85 m s−1 ...

Title: Fully Interactive And Refined Resolution Simulations Of The Martian Dust Cycle By The Marswrf Model, 2020 United Arab Emirates University

#### Title: Fully Interactive And Refined Resolution Simulations Of The Martian Dust Cycle By The Marswrf Model, Claus Gebhardt, Abdelgadir Abuelgasim, Ricardo M. Fonseca, Javier Martín-Torres, Maria-Paz Zorzano

##### National Space Science & Technology Center Datasets

The Mars climate model MarsWRF was run with fully interactive dust parametrization, assuming an infinite surface dust reservoir. Changing the horizontal resolution from 5°×5° to 2°×2° produced different dust cycle variability and dust source regions. The higher spatial resolution allowed for a better representation of the surface topography and associated surface dust lifting by wind stress, that is more consistent with observations. Global Dust Storm Events typically occurred if dust storm activity at northern Hellas Planitia connected with that at southern Chryse Planitia.

Lack Of Debye And Meissner Screening In Strongly Magnetized Quark Matter At Intermediate Densities, 2020 The University of Texas Rio Grande Valley

#### Lack Of Debye And Meissner Screening In Strongly Magnetized Quark Matter At Intermediate Densities, Bo Feng, Efrain J. Ferrer, Israel Portillo

##### Physics and Astronomy Faculty Publications and Presentations

We study the static responses of cold quark matter in the intermediate baryonic density region (characterized by a chemical potential μ) in the presence of a strong-magnetic field. We consider in particular, the so-called magnetic dual Chiral Density Wave (MDCDW) phase, which is materialized by an inhomogeneous condensate formed by a particle-hole pair. It is shown, that the MDCDW phase is more stable in the weak-coupling regime than the one considered in the magnetic catalysis of chiral symmetry braking phenomenon and even than the chiral symmetric phase that was expected to be realized at sufficiently high baryonic chemical potential. The ...

2020 California State University, San Bernardino

#### A Writing Intensive Upper Division Astrophysics/Planetary Science Course, Laura M. Woodney

##### Q2S Enhancing Pedagogy

This poster describes the major writing components of an upper division Astronomy or Planetary Science course. These components are intended to be integrated throughout the semester along with the content of the course. The papers the instructor chooses for the scaffolded assignments should compliment/enhance the content the students are learning in the course. This project used the "Backwards Design" method from Bean (2011, citation in poster): where the instructor first identifies the final project, determines what challenges the students will encounter attempting to do that project, and then builds scaffolded assignments intended to address each of these challenges. This ...

2020 University of Nevada, Las Vegas

#### Fast Radio Bursts From Interacting Binary Neutron Star Systems, Bing Zhang

##### Physics & Astronomy Faculty Publications

Recent observations of repeating fast radio bursts (FRBs) suggest that some FRBs reside in an environment consistent with that of binary neutron star (BNS) mergers. The bursting rate for repeaters could be very high and the emission site is likely from a magnetosphere. We discuss a hypothesis of producing abundant repeating FRBs in BNS systems. Decades to centuries before a BNS system coalesces, the magnetospheres of the two neutron stars start to interact relentlessly. Abrupt magnetic reconnection accelerates particles, which emit coherent radio waves in bunches via curvature radiation. FRBs are detected as these bright radiation beams point toward Earth ...

Asteroid Belt Survival Through Stellar Evolution: Dependence On The Stellar Mass, 2020 University of Nevada, Las Vegas

#### Asteroid Belt Survival Through Stellar Evolution: Dependence On The Stellar Mass, Rebecca G. Martin, Mario Livio, Jeremy L. Smallwood, Cheng Chen

##### Physics & Astronomy Faculty Publications

Polluted white dwarfs are generally accreting terrestrial-like material that may originate from a debris belt like the asteroid belt in the Solar system. ... See full text for complete abstract.

Gj 1252 B: A 1.2 R⊕ Planet Transiting An M3 Dwarf At 20.4 Pc, 2020 Swarthmore College

#### Gj 1252 B: A 1.2 R⊕ Planet Transiting An M3 Dwarf At 20.4 Pc, A. Shporer, K. A. Collins, N. Astudillo-Defru, J. Irwin, X. Bonfils, K. I. Collins, E. Matthews, J. G. Winters, D. R. Anderson, J. D. Armstrong, D. Charbonneau, R. Cloutier, T. Daylan, T. Gan, M. N. Günther, C. Hellier, K. Horne, C. X. Huang, Eric L.N. Jensen, J. Kielkopf, E. Palle, R. Sefako, K. G. Stassun, T.-G. Tan, A. Vanderburg, G. R. Ricker, D. W. Latham, R. Vanderspek, S. Seager, J. N. Winn, J. M. Jenkins, K. Colon, C. D. Dressing, S. Léepine, P. S. Muirhead, M. E. Rose, J. D. Twicken, J. N. Villasenor

##### Physics & Astronomy Faculty Works

We report the discovery of GJ 1252 b, a planet with a radius of 1.193 ± 0.074 R and an orbital period of 0.52 days around an M3-type star (0.381 ± 0.019 M, 0.391 ± 0.020 R) located 20.385 ± 0.019 pc away. We use Transiting Exoplanet Survey Satellite (TESS) data, ground-based photometry and spectroscopy, Gaia astrometry, and high angular resolution imaging to show that the transit signal seen in the TESS data must originate from a transiting planet. We do so by ruling out all false-positive scenarios that attempt to explain the transit signal ...

Effects Of Opacity Temperature Dependence On Radiatively Accelerated Clouds, 2020 Institute of Astronomy

#### Effects Of Opacity Temperature Dependence On Radiatively Accelerated Clouds, Sergei Dyda, Daniel Proga, Christopher S. Reynolds

##### Physics & Astronomy Faculty Publications

We study how different opacity–temperature scalings affect the dynamical evolution of irradiated gas clouds using time-dependent radiation-hydrodynamics simulations. When clouds are optically thick, the bright side heats up and expands, accelerating the cloud via the rocket effect. Clouds that become more optically thick as they heat accelerate ∼35 per cent faster than clouds that become optically thin. An enhancement of ∼85 per cent in the acceleration can be achieved by having a broken power-law opacity profile, which allows the evaporating gas driving the cloud to become optically thin and not attenuate the driving radiation flux. We find that up ...

Radiometric Stability Of The Saber Instrument, 2020 NASA Langley Research Center

#### Radiometric Stability Of The Saber Instrument, Martin G. Mlynczak, Taumi Daniels, Linda A. Hunt, Jia Yue, B. Thomas Marshall, James M. Russell Iii, Ellis E. Remsburg, Joseph Tansock, Roy Esplin, Mark Jensen, Andrew Shumway, Larry Gordley, J. -H. Yee

##### Space Dynamics Lab Publications

The SABER instrument on the National Aeronautics and Space Administration Thermosphere‐Ionosphere‐Mesosphere Energetics and Dynamics satellite continues to provide a long‐term record of Earth's stratosphere, mesosphere, and lower thermosphere. The SABER data are being used to examine long‐term changes and trends in temperature, water vapor, and carbon dioxide. A tacit, central assumption of these analyses is that the SABER instrument radiometric calibration is not changing with time; that is, the instrument is stable. SABER stratospheric temperatures and those derived from Global Positioning System Radio Occultation measurements are compared to examine SABER's stability. Global Positioning System ...

Fenderson, Julia Katharine (Squires), 1905-1989 (Sc 3500), 2020 Western Kentucky University

#### Fenderson, Julia Katharine (Squires), 1905-1989 (Sc 3500), Manuscripts & Folklife Archives

##### MSS Finding Aids

Finding aid only for Manuscripts Small Collection 3500. “The Viewing of Halley’s Comet: 1910-1986, A Personal Remembrance by Julia Squires Fenderson as told to Charles Arterburn,” a reminiscence by Mrs. Fenderson, of Culver City, California, of her viewings of Halley’s Comet: first with her father in 1910 at a Catholic mission in Albuquerque, New Mexico; and again in 1986, at the Santa Monica (California) College Planetarium. Includes an explanatory e-mail from Charles Arterburn.

Resolving The Fu Orionis System With Alma: Interacting Twin Disks?, 2020 Universidad de Santiago de Chile

#### Resolving The Fu Orionis System With Alma: Interacting Twin Disks?, Sebastian Perez, Antonio Hales, Hauyu Baobab Liu, Zhaohuan Zhu, Simon Casassus, Jonathan Williams, Alice Zurlo, Nicolas Cuello, Lucas Cieza, David Principe

##### Physics & Astronomy Faculty Publications

FU Orionis objects are low-mass pre-main sequence stars characterized by dramatic outbursts several magnitudes in brightness. These outbursts are linked to episodic accretion events in which stars gain a significant portion of their mass. The physical processes behind these accretion events are not yet well understood. The archetypal FU Ori system, FU Orionis, is composed of two young stars with detected gas and dust emission. The continuum emitting regions have not been resolved until now. Here, we present 1.3 mm observations of the FU Ori binary system using the Atacama Large Millimeter/submillimeter Array. The disks are resolved at ...

Calibration Transients In Ligo Detectors, 2020 Louisiana State University

#### Calibration Transients In Ligo Detectors, Thomas Daniel Abbott

##### LSU Doctoral Dissertations

This dissertation describes a novel method of analyzing fluctuations in the time-dependent calibration models of the LIGO interferometers to estimate their effect on strain reconstruction for gravitational-wave detections. The time-dependence of the calibration model of each detector is tracked with a set of parameters which are continuously measured while the interferometers are operating. These parameters track slow variations in the sensing function of the detectors as well as the actuators that hold the detectors in an operational state. The time-dependent parameter data during the second observation run (O2 [November 30, 2016 16:00 UTC to August 25, 2017 22:00 ...

Mass Determinations Of The Three Mini-Neptunes Transiting Toi-125, 2020 University of Geneva

#### Mass Determinations Of The Three Mini-Neptunes Transiting Toi-125, Louise D. Nielsen, D. Gandolfi, D. J. Armstrong, J. S. Jenkins, M. Fridlund, N. C. Santos, F. Dai, V. Adibekyan, R. Luque, Jason H. Steffen, M. Esposito, F. Meru, S. Sabotta, E. Bolmont, D. Kossakowski, J. F. Otegi, F. Murgas, M. Stalport, F. Rodler, M. R. Diaz, N. T. Kurtovic, G. Ricker, R. Vanderspek, D. W. Latham, S. Seager, J. N. Winn, J. M. Jenkins, R. Allart, J. M. Almenara, D. Barrado, S. C.C. Barros

##### Physics & Astronomy Faculty Publications

The Transiting Exoplanet Survey Satellite, TESS, is currently carrying out an all-sky search for small planets transiting bright stars. In the first year of the TESS survey, a steady progress was made in achieving the mission’s primary science goal of establishing bulk densities for 50 planets smaller than Neptune. During that year, the TESS’s observations were focused on the southern ecliptic hemisphere, resulting in the discovery of three mini-Neptunes orbiting the star TOI-125, a V = 11.0 K0 dwarf. We present intensive HARPS radial velocity observations, yielding precise mass measurements for TOI-125b, TOI-125c, and TOI-125d. TOI-125b has an ...