Addressing The Learning Loss During The Covid-19 Pandemic Through The Adaptation Of Virtual Platforms,
2021
CUNY York College
Addressing The Learning Loss During The Covid-19 Pandemic Through The Adaptation Of Virtual Platforms, Nazrul I. Khandaker, Anika Nawar Mayeesha, Violeta Escandon Correa, Toralv Munro, Andrew Singh, Matthew Khargie, Ality Aghedo, Jasmin Budhan, Krishna Mahabir, Belal A. Sayeed
Publications and Research
The York College-hosted NASA MAA (MUREP AEROSPACE ACADEMY) has always played a pivotal role in minimizing the learning loss during the summer months, which was heightened during the pandemic. Support from AT&T, Con Edison and NASA enabled the MAA program at York College to offer a virtual STEM education with an earth science concentration to 1000 plus underserved K1-12 students from the community last summer, including 160 high school students. Two factors made this endeavor fruitful: allowing additional time to engage in STEM lessons and increasing self-motivation to successfully accomplish assigned tasks. Students built partnerships and resolved technical issues with …
Leveraging The Popularity Of Virtual Conferencing Due To The Covid-19 Pandemic To Create New Opportunities For Stem Education,
2021
CUNY York College
Leveraging The Popularity Of Virtual Conferencing Due To The Covid-19 Pandemic To Create New Opportunities For Stem Education, Andrew Singh, Nazrul I. Khandaker, Violeta Escandon Correa, Omadevi Singh, Ariel Skobelsky, Farhan Tanvir, Brian Sukhnandan, Matthew Khargie, Elton Selby, Masud Ahmed
Publications and Research
Due to the COVID-19 pandemic, virtual learning has become a necessity for K9-16 education. Virtual classwork has been administered through platforms such as Google Classroom, Clever, and iReady. During the summer of 2021, the City University of New York (C.U.N.Y) York College campus hosted its NASA MAA MUREP (Minority University Research and Education Project Aerospace Academy) program virtually using a combination of Zoom, Google Docs, and even Canva, which some students requested as a more intuitive alternative to Microsoft PowerPoint. Students were mentored to use the scientific method to explore their interests in the STEM field, with a geoscience or …
Multi-Faceted Geoscience Research Using Open Access Resources: The Successful Participation Of K9-16 Students,
2021
CUNY York College
Multi-Faceted Geoscience Research Using Open Access Resources: The Successful Participation Of K9-16 Students, Nazrul I. Khandaker, Noshin Sharmili, Omadevi Singh, Gurwinder Sahota, Sol De Leon, Matthew Khargie, Ali Zarine, Krishna Mahabir, Adacia Teemal, Mildred M. Selby
Publications and Research
Students interested in geosciences, for the most part, missed out their traditional field- based research activities due to strict social distancing, travel restrictions and/or lacking financial support. An absence of physical laboratory opportunities forced students to choose topics deemed doable through online research. Available data from online sources on extreme weather related case studies, flooding, droughts, groundwater depletion in urban and suburban areas, coastal erosion rate, sealevel rise, landslides, earthquakes, volcanic eruptions, and atmospheric pollution became quite handy and lucrative. Readily available pertinent data sources enabled K9-16 students to conduct summer research at “stay home” situations. Selective peer mentoring was …
All-Sky Search For Continuous Gravitational Waves From Isolated Neutron Stars In The Early O3 Ligo Data,
2021
The University of Texas Rio Grande Valley
All-Sky Search For Continuous Gravitational Waves From Isolated Neutron Stars In The Early O3 Ligo Data, R. Abbott, T. D. Abbott, S. Abraham, Teviet Creighton, Mario C. Diaz, Volker Quetschke, Karla E. Ramirez, Wen Hui Wang
Physics & Astronomy Faculty Publications
We report on an all-sky search for continuous gravitational waves in the frequency band 20–2000 Hz and with a frequency time derivative in the range of [−1.0,+0.1]×10−8 Hz/s. Such a signal could be produced by a nearby, spinning and slightly nonaxisymmetric isolated neutron star in our Galaxy. This search uses the LIGO data from the first six months of Advanced LIGO’s and Advanced Virgo’s third observational run, O3. No periodic gravitational wave signals are observed, and 95% confidence-level (C.L.) frequentist upper limits are placed on their strengths. The lowest upper limits on worst-case (linearly polarized) strain amplitude h0 are ∼1.7×10−25 …
All-Sky Search For Continuous Gravitational Waves From Isolated Neutron Stars In The Early O3 Ligo Data,
2021
Andrews University
All-Sky Search For Continuous Gravitational Waves From Isolated Neutron Stars In The Early O3 Ligo Data, Ligo Scientific Collaboration, Virgo Collaboration, Kagra Collaboration, Tiffany Z. Summerscales
Faculty Publications
We report on an all-sky search for continuous gravitational waves in the frequency band 20–2000 Hz and with a frequency time derivative in the range of [−1.0,+0.1]×10−8 Hz/s. Such a signal could be produced by a nearby, spinning and slightly nonaxisymmetric isolated neutron star in our Galaxy. This search uses the LIGO data from the first six months of Advanced LIGO’s and Advanced Virgo’s third observational run, O3. No periodic gravitational wave signals are observed, and 95% confidence-level (C.L.) frequentist upper limits are placed on their strengths. The lowest upper limits on worst-case (linearly polarized) strain amplitude h0 are ∼1.7×10−25 …
Initial Acoustoelastic Measurements In Olivine: Investigating The Effect Of Stress On P- And S-Wave Velocities,
2021
University of Nevada, Las Vegas
Initial Acoustoelastic Measurements In Olivine: Investigating The Effect Of Stress On P- And S-Wave Velocities, Taryn K. Traylor, Pamela C. Burnley, M. L. Whitaker
Geoscience Faculty Research
It is well known that elasticity is a key physical property in the determination of the structure and composition of the Earth and provides critical information for the interpretation of seismic data. This study investigates the stress-induced variation in elastic wave velocities, known as the acoustoelastic effect, in San Carlos olivine. A recently developed experimental ultrasonic acoustic system, the Directly Integrated Acoustic System Combined with Pressure Experiments (DIASCoPE), was used with the D-DIA multi-anvil apparatus to transmit ultrasonic sound waves and collect the reflections. We use the DIASCoPE to obtain longitudinal (P) and shear (S) elastic wave velocities from San …
Galaxy And Mass Assembly (Gama): The Environmental Impact On Sfr And Metallicity In Galaxy Groups,
2021
University of Louisville
Galaxy And Mass Assembly (Gama): The Environmental Impact On Sfr And Metallicity In Galaxy Groups, D Sotillo-Ramos, M A. Lara-López, A M. Pérez-García, R Pérez-Martínez, A M. Hopkins, Benne Holwerda, J Liske, A R. López-Sánchez, M S. Owers, K A. Pimbblet
Faculty and Staff Scholarship
We present a study of the relationships and environmental dependencies between stellar mass, star formation rate, and gas metallicity for more than 700 galaxies in groups up to redshift 0.35 from the Galaxy And Mass Assembly (GAMA) survey. To identify the main drivers, our sample was analysed as a function of group-centric distance, projected galaxy number density, and stellar mass. By using control samples of more than 16 000 star-forming field galaxies and volume-limited samples, we find that the highest enhancement in SFR (0.3 dex) occurs in galaxies with the lowest local density. In contrast to previous work, our data …
Search For Lepton-Flavor-Violating Tau-Lepton Decays To ℓγ At Belle,
2021
Niigata University
Search For Lepton-Flavor-Violating Tau-Lepton Decays To ℓγ At Belle, K. Uno, K. Hayasaka, K. Inami, I. Adachi, H. Aihara, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, J. Bennett, F. Bernlochner, M. Bessner, V. Bhardwaj, J. Biswal, A. Bobrov, G. Bonvicini, A. Bozek, M. Bračko
Faculty and Student Publications
Charged lepton flavor violation is forbidden in the Standard Model but possible in several new physics scenarios. In many of these models, the radiative decays τ± → ℓ±γ (ℓ = e, μ) are predicted to have a sizeable probability, making them particularly interesting channels to search at various experiments. An updated search via τ± → ℓ±γ using full data of the Belle experiment, corresponding to an integrated luminosity of 988 fb−1, is reported for charged lepton flavor violation. No significant excess over background predictions from the Standard Model is observed, and the upper limits on the branching fractions, B(τ± → …
Flavor Su(3) In Cabibbo-Favored D-Meson Decays,
2021
Lawrence Technological University
Flavor Su(3) In Cabibbo-Favored D-Meson Decays, Bhubanjyoti Bhattacharya, Alakabha Datta, Alexey A. Petrov, John Waite
Faculty and Student Publications
Model-independent description of nonleptonic decays of charmed mesons is a challenging task due to large nonperturbative effects of strong interactions on the transition amplitudes. We discuss the equivalence of two different flavor-SU(3)-based descriptions of Cabibbo-favored non-leptonic decays of charmed mesons to two-pseudoscalars final states including the η and η′ mesons.
Hd 183579b: A Warm Sub-Neptune Transiting A Solar Twin Detected By Tess,
2021
Swarthmore College
Hd 183579b: A Warm Sub-Neptune Transiting A Solar Twin Detected By Tess, T. Gan, M. Bedell, S. X. Wang, D. Foreman-Mackey, J. Meléndez, S. Mao, K. G. Stassun, S. B. Howell, C. Ziegler, R. A. Wittenmyer, C. Hellier, K. A. Collins, A. Shporer, G. R. Ricker, R. Vanderspek, D. W. Latham, S. Seager, J. N. Winn, J. M. Jenkins, B. C. Addison, S. Ballard, T. Barclay, J. L. Bean, B. P. Bowler, C. Briceño, I. J. M. Crossfield, J. Dittman, J. Horner, Eric L.N. Jensen, S. R. Kane, J. Kielkopf, L. Kreidberg, N. Law, A. W. Mann, M. W. Mengel, E. D. Morgan, J. Okumura, H. P. Osborn, M. Paegert, P. Plavchan, R. P. Schwarz, B. Shiao, J. C. Smith, L. Spina, C. G. Tinney, G. Torres, J. D. Twicken, M. Vezie, G. Wang, D. J. Wright, H. Zhang
Physics & Astronomy Faculty Works
We report the discovery and characterization of a transiting warm sub-Neptune planet around the nearby bright (V = 8.75 mag, K = 7.15 mag) solar twin HD 183579, delivered by the Transiting Exoplanet Survey Satellite (TESS). The host star is located 56.8 ± 0.1 pc away with a radius of R* = 0.97 ± 0.02 R⊙ and a mass of M* = 1.03 ± 0.05 M⊙. We confirm the planetary nature by combining space and ground-based photometry, spectroscopy, and imaging. We find that HD 183579b (TOI-1055b) has a radius of Rp …
Toi-3362b: A Proto Hot Jupiter Undergoing High-Eccentricity Tidal Migration,
2021
Swarthmore College
Toi-3362b: A Proto Hot Jupiter Undergoing High-Eccentricity Tidal Migration, J. Dong, C. X. Huang, G. Zhou, R. I. Dawson, J. E. Rodriguez, J. D. Eastman, K. A. Collins, S. N. Quinn, A. Shporer, A. H. M. J. Triaud, S. Wang, T. Beatty, J. M. Jackson, K. I. Collins, L. Abe, O. Suarez, N. Crouzet, D. Mékarnia, G. Dransfield, Eric L.N. Jensen, C. Stockdale, K. Barkaoui, A. Heitzmann, D. J. Wright, B. C. Addison, R. A. Wittenmyer, J. Okumura, B. P. Bowler, J. Horner, S. R. Kane, J. Kielkopf, H. Liu, P. Plavchan, M. W. Mengel, G. R. Ricker, R. Vanderspek, D. W. Latham, S. Seager, J. N. Winn, J. M. Jenkins, J. L. Christiansen, M. Paegert
Physics & Astronomy Faculty Works
High-eccentricity tidal migration is a possible way for giant planets to be placed in short-period orbits. If this happens often, one would expect to catch proto hot Jupiters on highly elliptical orbits undergoing high-eccentricity tidal migration. As of yet, few such systems have been discovered. Here, we introduce TOI-3362b (TIC-464300749b), an 18.1 day, 5 MJup planet orbiting a main-sequence F-type star that is likely undergoing high-eccentricity tidal migration. The orbital eccentricity is 0.815 (+0.023)/(-0.032). With a semimajor axis of 0.153 (+0.002)/(-0.003) au, the planet's orbit is expected to shrink to a final orbital radius of 0.051 (+0.008)/(-0.006) au after …
Toi-431/Hip 26013: A Super-Earth And A Sub-Neptune Transiting A Bright, Early K Dwarf, With A Third Rv Planet,
2021
Swarthmore College
Toi-431/Hip 26013: A Super-Earth And A Sub-Neptune Transiting A Bright, Early K Dwarf, With A Third Rv Planet, A. Osborn, D. J. Armstrong, B. Cale, R. Brahm, R. A. Wittenmyer, F. Dai, I. J. M. Crossfield, E. M. Bryant, V. Adibekyan, R. Cloutier, K. A. Collins, E. Delgado Mena, M. Fridlund, C. Hellier, S. B. Howell, G. W. King, J. Lillo-Box, J. Otegi, S. Sousa, K. G. Stassun, E. C. Matthews, C. Ziegler, G. Ricker, R. Vanderspek, D. W. Latham, S. Seager, J. N. Winn, J. M. Jenkins, J. S. Acton, B. C. Addison, D. R. Anderson, S. Ballard, D. Barrado, S. C. C. Barros, N. Batalha, D. Bayliss, T. Barclay, B. Benneke, J. Berberian Jr., F. Bouchy, B. P. Bowler, C. Briceño, C. J. Burke, M. R. Burleigh, S. L. Casewell, D. Ciardi, K. I. Collins, B. F. Cooke, O. D. S. Demangeon, R. F. Díaz, C. Dorn, D. Dragomir, C. Dressing, X. Dumusque, N. Espinoza, P. Figueira, B. Fulton, E. Furlan, E. Gaidos, C. Geneser, S. Gill, M. R. Road, E. J. Gonzales, V. Gorjian, M. N. Günther, R. Helled, B. A. Henderson, T. Henning, A. Hogan, S. Hojjatpanah, J. Horner, A. W. Howard, S. Hoyer, D. Huber, H. Isaacson, J. S. Jenkins, Eric L.N. Jensen, A. Jordán, A. R. Kane, R. C. Kidwell Jr., J. Kielkopf, N. Law, M. Lendl, M. Lund, R. A. Matson, A. W. Mann, J. Mccormac, M. W. Mengel, F. Y. Morales, L. D. Nielsen, J. Okumura, H. P. Osborn, E. A. Petigura, P. Plavchan, D. Pollacco, E. V. Quintana, L. Raynard, P. Robertson, M. E. Rose, A. Roy, M. Reefe, A. Santerne, N. C. Santos, P. Sarkis, J. Schlieder, R. P. Schwarz, N. J. Scott, A. Shporer, A. M. S. Smith, C. Stibbard, C. Stockdale, P. A. Strøm, J. D. Twicken, T.-G. Tan, A. Tanner, J. Teske, R. H. Tilbrook, C. G. Tinney, S. Udry, J. N. Villaseñor, J. I. Vines, S. X. Wang, L. M. Weiss, R. G. West, P. J. Wheatley, D. J. Wright, H. Zhang, F. Zohrabi
Physics & Astronomy Faculty Works
We present the bright (Vmag = 9.12), multiplanet system TOI-431, characterized with photometry and radial velocities (RVs). We estimate the stellar rotation period to be 30.5 ± 0.7 d using archival photometry and RVs. Transiting Exoplanet Survey Satellite (TESS) objects of Interest (TOI)-431 b is a super-Earth with a period of 0.49 d, a radius of 1.28 ± 0.04 R⊕, a mass of 3.07 ± 0.35 M⊕, and a density of 8.0 ± 1.0 g cm⁻³; TOI-431 d is a sub-Neptune with a period of 12.46 d, a radius of 3.29 ± 0.09 …
Two Bright M Dwarfs Hosting Ultra-Short-Period Super-Earths With Earth-Like Compositions,
2021
Swarthmore College
Two Bright M Dwarfs Hosting Ultra-Short-Period Super-Earths With Earth-Like Compositions, T. Hirano, J. H. Livingston, A. Fukui, N. Narita, H. Harakawa, H. T. Ishikawa, K. Miyakawa, T. Kimura, A. Nakayama, N. Fujita, Y. Hori, K. G. Stassun, A. Bieryla, C. Cadieux, D. R. Ciardi, K. A. Collins, M. Ikoma, A. Vanderburg, T. Barclay, C. E. Brasseur, J. P. De Leon, J. P. Doty, R. Doyon, E. Esparza-Borges, G. A. Esquerdo, E. Furlan, E. Gaidos, E. J. Gonzales, K. Hodapp, S. B. Howell, K. Isogai, S. Jacobson, J. M. Jenkins, Eric L.N. Jensen, K. Kawauchi, T. Kotani, T. Kudo, S. Kurita, T. Kurokawa, N. Kusakabe, M. Kuzuhara, D. Lafrenière, D. W. Latham, B. Massey, M. Mori, F. Murgas, J. Nishikawa, T. Nishiumi, M. Omiya, M. Paegert, E. Palle, H. Parviainen, S. N. Quinn, G. R. Ricker, R. P. Schwarz, S. Seager, M. Tamura, P. Tenenbaum, Y. Terada, R. K. Vanderspek, S. Vievard, N. Watanabe, J. N. Winn
Physics & Astronomy Faculty Works
We present observations of two bright M dwarfs (TOI-1634 and TOI-1685: J = 9.5–9.6) hosting ultra-short-period (USP) planets identified by the TESS mission. The two stars are similar in temperature, mass, and radius (Teff ≈ 3500 K, M⋆ ≈ 0.45–0.46 M⊙, and R⋆ ≈ 0.45–0.46 R⊙), and the planets are both super-Earth size (1.25 R⊕ < Rp < 2.0 R⊕). For both systems, light curves from ground-based photometry exhibit planetary transits, whose depths are consistent with those from the TESS photometry. We also refine the transit ephemerides based on the ground-based …
The Magellan-Tess Survey. I. Survey Description And Midsurvey Results,
2021
Swarthmore College
The Magellan-Tess Survey. I. Survey Description And Midsurvey Results, J. Teske, S. X. Wang, A. Wolfgang, T. Gan, M. Plotnykov, D. J. Armstrong, R. P. Butler, B. Cale, J. D. Crane, W. Howard, Eric L.N. Jensen, N. Law, S. A. Shectman, P. Plavchan, D. Valencia, A. Vanderburg, G. R. Ricker, R. Vanderspek, D. W. Latham, S. Seager, J. N. Winn, J. M. Jenkins, V. Adibekyan, D. Barrado, S. C. C. Barros, Z. Benkhaldoun, D. J. A. Brown, E. M. Bryant, J. Burt, D. A. Caldwell, D. Charbonneau, R. Cloutier, K. A. Collins, K. I. Collins, K. D. Colon, D. M. Conti, O. D. S. Demangeon, J. D. Eastman, M. Elmufti, F. Feng, E. Flowers, N. M. Guerrero, S. Hojjatpanah, J. M. Irwin, G. Isopi, J. Lillo-Box, F. Mallia, B. Massey, M. Mori, S. E. Mullally, N. Narita, T. Nishiumi, A. Osborn, M. Paegert, J. P. De Leon, S. N. Quinn, M. Reefe, R. P. Schwarz, A. Shporer, A. Soubkiou, S. G. Sousa, C. Stockdale, P. A. Strøm, T.-G. Tan, J. Tang, P. Tenenbaum, P. J. Wheatley, J. Wittrock, D. A. Yahalomi, F. Zohrabi
Physics & Astronomy Faculty Works
Kepler revealed that roughly one-third of Sunlike stars host planets orbiting within 100 days and between the size of Earth and Neptune. How do these planets form, what are they made of, and do they represent a continuous population or multiple populations? To help address these questions, we began the Magellan-TESS Survey (MTS), which uses Magellan II/PFS to obtain radial velocity (RV) masses of 30 TESS-detected exoplanets and develops an analysis framework that connects observed planet distributions to underlying populations. In the past, small-planet RV measurements have been challenging to obtain due to host star faintness and low RV semiamplitudes …
The Mass Of Β Pictoris C From Β Pictoris B Orbital Motion,
2021
Sorbonne Université
The Mass Of Β Pictoris C From Β Pictoris B Orbital Motion, S. Lacour, J. J. Wang, L. Rodet, M. Nowak, J. Shangguan, H. Beust, A. M. Lagrange, R. Abuter, A. Amorim, R. Asensio-Torres, M. Benisty, J. P. Berger, S. Blunt, A. Boccaletti, A. Bohn, M. L. Bolzer, M. Bonnefoy, H. Bonnet, G. Bourdarot, W. Brandner, F. Cantalloube, P. Caselli, B. Charnay, G. Chauvin, E. Choquet, V. Christiaens, Y. Clénet, V. Coudé Du Foresto, A. Cridland, R. Dembet, J. Dexter, P. T. De Zeeuw, K. Ward-Duong, Et Al
Astronomy: Faculty Publications
Aims. We aim to demonstrate that the presence and mass of an exoplanet can now be effectively derived from the astrometry of another exoplanet. Methods. We combined previous astrometry of β Pictoris b with a new set of observations from the GRAVITY interferometer. The orbital motion of β Pictoris b is fit using Markov chain Monte Carlo simulations in Jacobi coordinates. The inner planet, β Pictoris c, was also reobserved at a separation of 96 mas, confirming the previous orbital estimations. Results. From the astrometry of planet b only, we can (i) detect the presence of β Pictoris c and …
The Morphology And Evolution Of Transverse Aeolian Ridges On Mars,
2021
University of New Mexico - Main Campus
The Morphology And Evolution Of Transverse Aeolian Ridges On Mars, Timothy Paul Nagle-Mcnaughton
Earth and Planetary Sciences ETDs
Transverse aeolian ridges (TARs) are enigmatic and largely relict bedforms on the surface of Mars. TARs are sparsely distributed but common on Mars, but their history, preservation, and past role in the sediment cycle is not well understood. First described in 2003, and detailed extensively in 2008, our study of TARs has been narrowly focused in the last decade, with more and more research noting their presence, but little investigation of the features themselves. Recent work has mostly focused on identifying Terran analogues for TARs, but TARs remain largely a unique Martian feature. In this manuscript, I clarify and refine …
Realistic Binary Neutron Stars Collisions Simulations: Challenges And Opportunities,
2021
Marshall University
Realistic Binary Neutron Stars Collisions Simulations: Challenges And Opportunities, Maria Babiuc-Hamilton
Physics Faculty Research
Since 2015, when the LIGO-Virgo collaboration announced the first simultaneous detections of gravitational waves (GW150914) until now, more than 66 gravitational wave detections were reported, but only two signals came from a binary neutron star collision, the GW170817 and GW190425 events. GW170817 was accompanied by an electromagnetic outburst manifested as a kilonova and an off-axis jet. However, no conclusive electromagnetic signature was found to come from the GW190425. Indeed, nature proves again more complicated than our models, and it is still a big question how to model kilonovae, or to understand the mechanisms driving astrophysical jets and gamma ray bursts. …
Deep Underground Neutrino Experiment (Dune) Near Detector Conceptual Design Report,
2021
University of South Carolina
Deep Underground Neutrino Experiment (Dune) Near Detector Conceptual Design Report, A. Abed Abud, B. Abi, R. Acciarri, M. A. Acero, G. Adamov, D. Adams, M. Adinolfi, A. Aduzskiewicz, Z. Ahmad, J. Ahmed, T. Alion, S. Alonso Monsalve, M. Alrashed, C. Alt, A. Alton, P. Amedo, J. Anderson, C. Andreopoulos, M. P. Andrews, F. Andrianala, Roberto Petti, Et. Al.
Faculty Publications
The Deep Underground Neutrino Experiment (DUNE) is an international, world-class experiment aimed at exploring fundamental questions about the universe that are at the forefront of astrophysics and particle physics research. DUNE will study questions pertaining to the preponderance of matter over antimatter in the early universe, the dynamics of supernovae, the subtleties of neutrino interaction physics, and a number of beyond the Standard Model topics accessible in a powerful neutrino beam. A critical component of the DUNE physics program involves the study of changes in a powerful beam of neutrinos, i.e., neutrino oscillations, as the neutrinos propagate a long distance. …
The Loneliest Galaxies In The Universe: A Gama And Galaxyzoo Study On Void Galaxy Morphology,
2021
University of Louisville
The Loneliest Galaxies In The Universe: A Gama And Galaxyzoo Study On Void Galaxy Morphology, Lori E. Porter, Benne W. Holwerda
The Cardinal Edge
The large-scale structure (LSS) of the universe is comprised of galaxy filaments, tendrils, and voids. The majority of the universe’s volume is taken up by these voids, which exist as underdense, but not empty, regions. The galaxies found inside voids are void galaxies and expected to be some of the most isolated objects in the universe. However, their standard morphology remains poorly studied. This study, using the Galaxy and Mass Assembly (GAMA) survey and Galaxy Zoo’s SDSS survey, aims to remedy this. To do so, survey results from GAMA have been plotted using the Sérsic index (n) to analyze morphology, …
Following The Lithium: Tracing Li-Bearing Molecules Across Age, Mass, And Gravity In Brown Dwarfs,
2021
Dordt University
Following The Lithium: Tracing Li-Bearing Molecules Across Age, Mass, And Gravity In Brown Dwarfs, Ehsan Gharib-Nezhad, Mark S. Marley, Natasha E. Batalha, Channon Visscher, Richard S. Freedman, Roxana E. Lupu
Faculty Work Comprehensive List
Lithium is an important element for the understanding of ultracool dwarfs because it is lost to fusion at masses above ∼68 MJ. Hence, the presence of atomic Li has served as an indicator of the nearby H-burning boundary at about 75 MJ between brown dwarfs and very low mass stars. Historically, the “lithium test,” a search for the presence of the Li line at 670.8 nm, has been a marker if an object has a substellar mass. While the Li test could, in principle, be used to distinguish masses of later-type L–T dwarfs, Li is predominantly no longer found as …
