Article
Astronomy & Astrophysics
Ben J. Sutlieff, Alexander J. Bohn, Jayne L. Birkby, Matthew A. Kenworthy, Katie M. Morzinski, David S. Doelman, Jared R. Males, Frans Snik, Laird M. Close, Philip M. Hinz, David Charbonneau
Summary: The vAPP coronagraph is effective in high-contrast imaging by modifying the PSF to create a dark hole for deep flux suppression. In this study, the vAPP coronagraph was used to recover the brown dwarf HR 2562 B in the L-band, with successful extraction of the companion using different processing techniques. The atmospheric modeling of HR 2562 B indicates a spectral type at the L/T transition, with varying effective temperature and surface gravity depending on the wavebands considered.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
G. P. P. L. Otten, A. Vigan, E. Muslimov, M. N'Diaye, E. Choquet, U. Seemann, K. Dohlen, M. Houlle, P. Cristofari, M. W. Phillips, Y. Charles, I Baraffe, J-L Beuzit, A. Costille, R. Dorn, M. El Morsy, M. Kasper, M. Lopez, C. Mordasini, R. Pourcelot, A. Reiners, J-F Sauvage
Summary: Studies have shown that using a combination of high-contrast imaging and high spectral resolution can improve the characterization of atmospheres of directly imaged extrasolar planets; the proposed HiRISE fiber coupling between SPHERE and CRIRES+ at the Very Large Telescope performs significantly well for spectral characterization of directly imaged planets, especially for companions around bright hosts compared to CRIRES+.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
N. P. Gentile Fusillo, C. J. Manser, Boris T. Gaensicke, O. Toloza, D. Koester, E. Dennihy, W. R. Brown, J. Farihi, M. A. Hollands, M. J. Hoskin, P. Izquierdo, T. Kinnear, T. R. Marsh, A. Santamaria-Miranda, A. F. Pala, S. Redfield, P. Rodriguez-Gil, M. R. Schreiber, Dimitri Veras, D. J. Wilson
Summary: A survey of planetary remnants using a large number of white dwarfs identified six white dwarfs with gaseous debris discs, highlighting the unique features of three systems. These discoveries shed light on the underlying diversity in gaseous debris disc systems and bring the total number of these objects to 21.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Arianna Musso Barcucci, Ralf Launhardt, Andre Mueller, Grant M. Kennedy, Roy van Boekel, Thomas Henning, Henrik L. Ruh, Sebastian Marino, Tim D. Pearce, Stefan S. Brems, Steve Ertel, Eckhart A. Spalding
Summary: The researchers conducted a survey called LIStEN targeting 28 nearby stars to detect new companions and study their interactions with discs, but no new companions were found. By combining mass detection limits with disc characteristics and proper motion information, they constrained the presence of unseen planetary and low-mass stellar companions around the 24 disc-hosting stars in the survey.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
J. Subjak, N. Lodieu, P. Kabath, H. M. J. Boffin, G. Nowak, F. Grundahl, V. J. S. Bejar, M. R. Zapatero Osorio, V. Antoci
Summary: This study aims to understand the role of wide brown dwarf companions in planetary systems. High-resolution spectra of six bright stars with wide substellar companions were obtained, and radial velocities and physical stellar parameters were derived. The study confirmed the substellar nature of the wide companions and identified planets in some of the systems. The study also found that systems with wide brown dwarf companions have a different distribution of planetary parameters compared to single stars.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Jack S. Acton, Michael R. Goad, Matthew R. Burleigh, Sarah L. Casewell, Hannes Breytenbach, Louise D. Nielsen, Gareth Smith, David R. Anderson, Matthew P. Battley, Daniel Bayliss, Francois Bouchy, Edward M. Bryant, Szilard Csizmadia, Philipp Eigmueller, Samuel Gill, Edward Gillen, Nolan Grieves, Maximilian N. Gunther, Beth A. Henderson, Simon T. Hodgkin, James A. G. Jackman, James S. Jenkins, Monika Lendl, James McCormac, Maximiliano Moyano, Richard P. Nelson, Ramotholo R. Sefako, Alexis M. S. Smith, Manu Stalport, Jessymol K. Thomas, Rosanna H. Tilbrook, Stephane Udry, Richard G. West, Peter J. Wheatley, Hannah L. Worters, Jose Vines, Douglas R. Alves
Summary: NGTS-19b is a high-mass transiting brown dwarf discovered by the Next Generation Transit Survey, orbiting a K-star with a long period and high eccentricity. Despite its mass and relatively low levels of irradiation, the brown dwarf appears to be inflated, contradicting its estimated age.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Afra Ashraf, Daniella C. Bardalez Gagliuffi, Elena Manjavacas, Johanna M. Vos, Claire Mechmann, Jacqueline K. Faherty
Summary: This study presents a technique to identify spectrophotometrically variable L7-T3 brown dwarfs using single-epoch, low-resolution, near-infrared SpeX spectra. The authors calculated spectral indices on known variable brown dwarfs and used them to select 11 index-index parameter spaces where known variables can be distinguished from the rest of the general population of brown dwarfs. They identified 62 candidate variables, 12 of which showed significant variability amplitude in independent photometric monitoring surveys. This technique will be useful for prioritizing targets for future photometric and spectroscopic monitoring.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Jenni R. French, Sarah L. Casewell, Trent J. Dupuy, John H. Debes, Elena Manjavacas, Emily C. Martin, Siyi Xu
Summary: We confirm SDSS J222551.65+001637.7AB as a closely separated, resolved white dwarf-brown dwarf binary. The binary consists of a white dwarf with a temperature of 10926 +/- 246 K and a brown dwarf companion of L4 spectral type, separated by 0.9498 +/- 0.0022 arcsec. The age of the binary is estimated to be 1.97(-0.76)(+4.41) Gyr. This binary is likely a member of the thick disc and is the third closest spatially resolved white dwarf-brown dwarf binary known.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Rafael Martinez-Brunner, Simon Casassus, Sebastian Perez, Antonio Hales, Philipp Weber, Miguel Carcamo, Carla Arce-Tord, Lucas Cieza, Antonio Garufi, Sebastian Marino, Alice Zurlo
Summary: We present a physical model of the gas-rich disc of the nearby V4046 Sgr spectroscopic binary based on high resolution ALMA observations, SPHERE-IRDIS polarised images, and a well-sampled spectral energy distribution (SED). Our observations reveal the presence of thin rings (Ring13 and Ring24) with a wide gap in between, as well as a central emission interpreted as a tight circumbinary ring. The model also requires an inner ring (Ring5) composed mainly of small dust grains. The findings suggest a forward-scattering phase function and provide insights into the structure and composition of the disc.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Benjamin L. Augenbraun, Sean Burchesky, Andrew Winnicki, John M. Doyle
Summary: This study presents a detailed laser spectroscopic study on the transitions of calcium(I) phenoxide. The rotational band systems are analyzed, and the structure of calcium monophenoxide is compared to other calcium radicals. This work shows the potential application of functionalizing aromatic molecules for laser-based control.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Astronomy & Astrophysics
Angelica Psaridi, Francois Bouchy, Monika Lendl, Nolan Grieves, Keivan G. Stassun, Theron Carmichael, Samuel Gill, Pablo A. Pena Rojas, Tianjun Gan, Avi Shporer, Allyson Bieryla, Rafael Brahm, Jessie L. Christiansen, Ian J. M. Crossfield, Franck Galland, Matthew J. Hooton, Jon M. Jenkins, James S. Jenkins, David W. Latham, Michael B. Lund, Joseph E. Rodriguez, Eric B. Ting, Stephane Udry, Solene Ulmer-Moll, Robert A. Wittenmyer, Yanzhe Zhang, George Zhou, Brett Addison, Marion Cointepas, Karen A. Collins, Kevin I. Collins, Adrien Deline, Courtney D. Dressing, Phil Evans, Steven Giacalone, Alexis Heitzmann, Ismael Mireles, Dany Mounzer, Jon Otegi, Don J. Radford, Alexander Rudat, Joshua E. Schlieder, Richard P. Schwarz, Gregor Srdoc, Chris Stockdale, Olga Suarez, Duncan J. Wright, Yinan Zhao
Summary: The study aims to detect and characterize exoplanets and brown dwarfs orbiting early-type stars and has identified three brown dwarf companions and one massive planet, as well as four low-mass eclipsing components. The findings contribute to the understanding of these systems and add to the growing population of well-characterized giant planets and brown dwarfs transiting AF-type stars.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Dorsa Majidi, John C. Forbes, Abraham Loeb
Summary: Under the right conditions, brown dwarfs that gain enough mass late in their lives to cross the hydrogen-burning limit will remain essentially brown dwarf-like. Accretion from AGB winds, aided by the wind Roche lobe overflow mechanism, is likely to produce a substantial population of observable overmassive brown dwarfs, while other mechanisms are also plausible.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Beth A. Biller, Daniel Apai, Mickael Bonnefoy, Silvano Desidera, Raffaele Gratton, Markus Kasper, Matthew Kenworthy, Anne-Marie Lagrange, Cecilia Lazzoni, Dino Mesa, Arthur Vigan, Kevin Wagner, Johanna M. Vos, Alice Zurlo
Summary: The study found that the planets HR8799bc display similar colors and spectra to other young exoplanets, suggesting similar variability trends. However, differences were observed in the satellite spot lightcurves. By tracking non-shared variations between different planets and analyzing simulated lightcurves, they explored the differences.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
S. Dalal, F. Kiefer, G. Hebrard, J. Sahlmann, S. G. Sousa, T. Forveille, X. Delfosse, L. Arnold, N. Astudillo-Defru, X. Bonfils, I Boisse, F. Bouchy, V Bourrier, B. Brugger, P. Cortes-Zuleta, M. Deleuil, D. S. Demangeon, R. F. Diaz, N. C. Hara, N. Heidari, M. J. Hobson, T. Lopez, C. Lovis, Martioli, L. Mignon, O. Mousis, C. Moutou, J. Rey, A. Santerne, N. C. Santos, Segransan, P. A. Strom, S. Udry
Summary: This study identifies and characterizes 6 cool Jupiters, 3 brown dwarf candidates, and 16 low-mass stellar companions using radial velocity surveys. The discovery of a new, highly eccentric cool Jupiter, BD+631405 b, adds to the diversity of substellar objects. The findings help constrain models of formation and evolution for substellar objects and low-mass stars.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
R. E. Ryan, P. Thorman, C. Aganze, A. J. Burgasser, S. H. Cohen, N. P. Hathi, B. Holwerda, N. Pirzkal, R. A. Windhorst
Summary: In this study, a self-consistent model of the Milky Way is presented to reproduce the observed distributions and total velocity dispersion of brown dwarfs. The results suggest that brown dwarfs likely form via similar processes as main-sequence stars. Wide-field infrared imaging or low-resolution spectroscopic surveys are recommended for further refinement of these conclusions.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
T. -H. Hsieh, D. M. Segura-Cox, J. E. Pineda, P. Caselli, L. Bouscasse, R. Neri, A. Lopez-Sepulcre, M. T. Valdivia-Mena, M. J. Maureira, Th. Henning, G. V. Smirnov-Pinchukov, D. Semenov, Th. Moeller, N. Cunningham, A. Fuente, S. Marino, A. Dutrey, M. Tafalla, E. Chapillon, C. Ceccarelli, B. Zhao
Summary: This study presents high-sensitivity and high spectral-resolution observations of the binary system SVS13A using NOEMA. Complex line profiles at disk scales suggest the presence of multiple velocity components and significant variations in physical conditions within the circumbinary disk. Furthermore, the observations indicate the possible existence of an infalling streamer feeding material into the central region. Overall, this research provides valuable insights into the chemistry, physics, and accretion processes of interstellar matter.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
S. Hinkley, S. Lacour, G. -D. Marleau, A. -M. Lagrange, J. J. Wang, J. Kammerer, A. Cumming, M. Nowak, L. Rodet, T. Stolker, W. -O. Balmer, S. Ray, M. Bonnefoy, P. Molliere, C. Lazzoni, G. Kennedy, C. Mordasini, R. Abuter, S. Aigrain, A. Amorim, R. Asensio-Torres, C. Babusiaux, M. Benisty, J. -P. Berger, H. Beust, S. Blunt, A. Boccaletti, A. Bohn, H. Bonnet, G. Bourdarot, W. Brandner, F. Cantalloube, P. Caselli, B. Charnay, G. Chauvin, A. Chomez, E. Choquet, V. Christiaens, Y. Clenet, V. Coude du Foresto, A. Cridland, P. Delorme, R. Dembet, A. Drescher, G. Duvert, A. Eckart, F. Eisenhauer, H. Feuchtgruber, F. Galland, P. Garcia, R. Garcia Lopez, T. Gardner, E. Gendron, R. Genzel, S. Gillessen, J. H. Girard, A. Grandjean, X. Haubois, G. Heissel, Th Henning, S. Hippler, M. Horrobin, M. Houlle, Z. Hubert, L. Jocou, M. Keppler, P. Kervella, L. Kreidberg, V. Lapeyrere, J. -B. Le Bouquin, P. Lena, D. Lutz, A-L Maire, F. Mang, A. Merand, N. Meunier, J. D. Monnier, D. Mouillet, E. Nasedkin, T. Ott, G. P. P. L. Otten, C. Paladini, T. Paumard, K. Perraut, G. Perrin, F. Philipot, O. Pfuhl, N. Pourre, L. Pueyo, J. Rameau, E. Rickman, P. Rubini, Z. Rustamkulov, M. Samland, J. Shangguan, T. Shimizu, D. Sing, C. Straubmeier, E. Sturm, L. J. Tacconi, E. F. van Dishoeck, A. Vigan, F. Vincent, K. Ward-Duong, F. Widmann, E. Wieprecht, E. Wiezorrek, J. Woillez, S. Yazici, A. Young, N. Zicher
Summary: Using data from HARPS spectrograph and Gaia host star astrometry, researchers have discovered a companion HD206893c with an orbital separation of 3.53 au. The study also provides a dynamical mass estimation and age for the system. This discovery shows the potential of using Gaia astrometry for direct imaging and characterization of exoplanets.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
S. B. Brown-Sevilla, A. L. Maire, P. Molliere, M. Samland, M. Feldt, W. Brandner, Th. Henning, R. Gratton, M. Janson, T. Stolker, J. Hagelberg, A. Zurlo, F. Cantalloube, A. Boccaletti, M. Bonnefoy, G. Chauvin, S. Desidera, V. D'Orazi, A. -M. Lagrange, M. Langlois, F. Menard, D. Mesa, M. Meyer, A. Pavlov, C. Petit, S. Rochat, D. Rouan, T. Schmidt, A. Vigan, L. Weber
Summary: The aim of this study is to better understand the atmospheric properties of the directly imaged exoplanet 51 Eri b using a retrieval approach with higher signal-to-noise ratio data. The researchers used the radiative transfer code petitRADTRANS to analyze near-infrared SPHERE observations and compare the results with self-consistent models. The findings suggest that atmospheric retrievals should be considered together with self-consistent temperature structures to better characterize and determine the cloudiness of exoplanet atmospheres.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
J. A. Wojtczak, L. Labadie, K. Perraut, B. Tessore, A. Soulain, V. Ganci, J. Bouvier, C. Dougados, E. Alecian, H. Nowacki, G. Cozzo, W. Brandner, A. Caratti O. Garatti, P. Garcia, R. Garcia Lopez, J. Sanchez-Bermudez, A. Amorim, M. Benisty, J. -P. Berger, G. Bourdarot, P. Caselli, Y. Clenet, P. T. de Zeeuw, R. Davies, A. Drescher, G. Duvert, A. Eckart, F. Eisenhauer, F. Eupen, N. M. Foerster-Schreiber, E. Gendron, S. Gillessen, S. Grant, R. Grellmann, G. Heissel, Th. Henning, S. Hippler, M. Horrobin, Z. Hubert, L. Jocou, P. Kervella, S. Lacour, V. Lapeyrere, J. -B. Le Bouquin, P. Lena, D. Lutz, F. Mang, T. Ott, T. Paumard, G. Perrin, S. Scheithauer, J. Shangguan, T. Shimizu, S. Spezzano, O. Straub, C. Straubmeier, E. Sturm, E. van Dishoeck, F. Vincent, F. Widmann
Summary: We observed seven T Tauri stars using interferometry and found that five of them exhibit emission regions in the expected range for magnetospheric truncation, while two of them show emission primarily from within the co-rotation radius, indicating magnetospheric accretion as the primary driver of Br gamma radiation. Two objects exhibit extended emission beyond 10 stellar radii, suggesting additional contributions from outflows. These results are important for understanding the radiation sources in the inner disk regions.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Hirofumi Noda, Taisei Mineta, Takeo Minezaki, Hiroaki Sameshima, Mitsuru Kokubo, Taiki Kawamuro, Satoshi Yamada, Takashi Horiuchi, Hironori Matsumoto, Makoto Watanabe, Kumiko Morihana, Yoichi Itoh, Koji S. Kawabata, Yasushi Fukazawa
Summary: It is still unclear whether materials in broad-line regions (BLRs) in changing-look active galactic nuclei (CLAGNs) appear and disappear during the type-transition or remain at the same location while the line production is simply activated or deactivated. In this study, X-ray-optical monitoring of a CLAGN, NGC 3516, revealed significant variations of the narrow Fe-K alpha emission line on a timescale of tens of days during the type-2 phase. A time lag of 10.1-5.6+5.8 was derived through narrow Fe-K alpha reverberation mapping, comparing its flux variation with those of the X-ray continuum and B-band continuum.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Tianshu Wang, Adam Burrows
Summary: In this paper, the effects of closure choices on various physical quantities in 1D and 2D time-dependent core-collapse supernova simulations are compared using the multigroup radiation hydrodynamics code FORNAX. It is found that the third-order closure relations have only slight influence on the time-dependent simulations. The second-order closure relation choices have larger consequences, but these are still small compared to other variations due to uncertainties in some physical inputs.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Ryosuke Miyawaki, Masahiko Hayashi, Tetsuo Hasegawa
Summary: In this study, 250 GHz continuum and H29 alpha line data were observed towards W 49 N:A2, a hypercompact H II region ionized by an O9 star, using ALMA. The data confirmed the presence of an ionized ring with a radius of about 700 au, inclined by about 50°. The ring is expanding in the equatorial plane and shows signs of rotation, suggesting that it may be a remnant of the accretion disk that fed the O9 star.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
(2023)
Article
Astronomy & Astrophysics
Everett Schlawin, Thomas Beatty, Brian Brooks, Nikolay K. Nikolov, Thomas P. Greene, Nestor Espinoza, Kayli Glidic, Keith Baka, Eiichi Egami, John Stansberry, Martha Boyer, Mario Gennaro, Jarron Leisenring, Bryan Hilbert, Karl Misselt, Doug Kelly, Alicia Canipe, Charles Beichman, Matteo Correnti, J. Scott Knight, Alden Jurling, Marshall D. Perrin, Lee D. Feinberg, Michael W. McElwain, Nicholas Bond, David Ciardi, Sarah Kendrew, Marcia Rieke
Summary: JWST NIRCam's short-wavelength photometry was used to capture the transit lightcurve of exoplanet HAT-P-14 b for performance assessment. The study found that the short-wavelength precision is 152 ppm, with short characteristic timescales of 5-15 minutes. Additionally, the method is well suited to measure the real-time wave-front error of JWST.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
(2023)
Article
Astronomy & Astrophysics
G. Yoffe, R. van Boekel, A. Li, L. B. F. M. Waters, K. Maaskant, R. Siebenmorgen, M. van den Ancker, D. J. M. Petit Dit de la Roche, B. Lopez, A. Matter, J. Varga, M. R. Hogerheijde, G. Weigelt, R. D. Oudmaijer, E. Pantin, M. R. Meyer, J. -C. Augereau, Th. Henning
Summary: Research finds that the emission from polycyclic aromatic hydrocarbons (PAHs) comes from the upper layers of protoplanetary disks, higher than scattered light and similar to millimeter line emission. The intensity profiles of PAHs trace gas distribution and can constrain the penetration depth of UV radiation.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
A. Bello-Garcia, V. M. Passegger, J. Ordieres-Mere, A. Schweitzer, J. A. Caballero, A. Gonzalez-Marcos, I. Ribas, A. Reiners, A. Quirrenbach, P. J. Amado, V. J. S. Bejar, C. Cifuentes, Th. Henning, A. Kaminski, R. Luque, D. Montes, J. C. Morales, S. Pedraz, H. M. Tabernero, M. Zechmeister
Summary: This study demonstrates the feasibility of applying deep transfer learning (DTL) in the framework of determining photospheric stellar parameters. By using internal feature representations and independent parameter measurements as new inputs, DTL provides higher accuracy compared to previous deep learning (DL) methods. The precision of machine learning also improves with DTL. These results indicate that DTL is a robust tool for obtaining M-dwarf stellar parameters comparable to independent estimations.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Brianna Lacy, Adam Burrows
Summary: Y dwarfs are the coolest class of brown dwarf, with effective temperatures below 500 K and detection as low as 250 K. They are important for understanding planet and star formation and serve as analogs for giant gaseous exoplanets. Their spectra are influenced by water, methane, and ammonia.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Melissa J. Hobson, Andres Jordan, E. M. Bryant, R. Brahm, D. Bayliss, J. D. Hartman, G. A. Bakos, Th. Henning, Jose Manuel Almenara, Khalid Barkaoui, Zouhair Benkhaldoun, Xavier Bonfils, Francois Bouchy, David Charbonneau, Marion Cointepas, Karen A. Collins, Jason D. Eastman, Mourad Ghachoui, Michael Gillon, Robert F. Goeke, Keith Horne, Jonathan M. Irwin, Emmanuel Jehin, Jon M. Jenkins, David W. Latham, Dan Moldovan, Felipe Murgas, Francisco J. Pozuelos, George R. Ricker, Richard P. Schwarz, S. Seager, Gregor Srdoc, Stephanie Striegel, Mathilde Timmermans, Andrew Vanderburg, Roland Vanderspek, Joshua N. Winn
Summary: We have discovered TOI-3235 b, a short-period Jupiter orbiting an M dwarf star close to the transition point from partially to fully convective. The planet was identified through TESS photometry and later confirmed with radial velocities and ground-based photometry. With a mass of 0.665 +/- 0.025 M-J and a radius of 1.017 +/- 0.044 R-J, TOI-3235 b orbits its host star closely but has a lower equilibrium temperature than expected for hot Jupiters. This discovery challenges current planet formation models and makes TOI-3235 b a suitable target for atmospheric characterization.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Multidisciplinary Sciences
Thayne Currie, Mirek Brandt, Timothy D. Brandt, Brianna Lacy, Adam Burrows, Olivier Guyon, Motohide Tamura, Ranger Y. Liu, Sabina Sagynbayeva, Taylor Tobin, Jeffrey Chilcote, Tyler Groff, Christian Marois, William Thompson, Simon J. Murphy, Masayuki Kuzuhara, Kellen Lawson, Julien Lozi, Vincent Deo, Sebastien Vievard, Nour Skaf, Taichi Uyama, Nemanja Jovanovic, Frantz Martinache, N. Jeremy Kasdin, Tomoyuki Kudo, Michael McElwain, Markus Janson, John Wisniewski, Klaus Hodapp, Jun Nishikawa, Krzysztof Helminiak, Jungmi Kwon, Masahiko Hayashi
Summary: Using direct imaging, we have discovered a gas giant exoplanet, HIP 99770 b, located around 17 astronomical units away from its host star. The planet has a mass of 13.9 to 16.1 Jupiter masses and a similar atmospheric spectrum to previously imaged exoplanets around HR 8799.
Article
Astronomy & Astrophysics
Tianshu Wang, Adam Burrows
Summary: In this paper, the researchers conducted 12 unprecedentedly long-duration 3D core-collapse supernova simulations to study the neutrino-driven winds. The results show that the winds in the simulations have transonic outflows that are faster than the surrounding ejecta and originate from a turbulent and rotating proto-neutron star surface atmosphere. The researchers also found that the winds exhibit deformations, aspherical shapes, and can be channeled by their environment. The thermal properties of the winds behave differently for progenitors of different masses, with the less massive progenitors showing similarities to 1D stationary solutions and the more massive progenitors deviating significantly due to aspherical accretion. Additionally, the researchers observed stochastic temporal evolution in the Y e (electron fraction) of the winds and the production of some neutron-rich isotopes. Although no strong r-process was observed, weak r-processes were found to occur, resulting in the synthesis of isotopes up to 90Zr in some models. The integrated wind component was found to be at most a few percent of a solar mass, while the energy carried by the wind itself could be as much as 10%-20% of the total explosion energy.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
David Vartanyan, Adam Burrows, Tianshu Wang, Matthew S. B. Coleman, Christopher J. White
Summary: We calculate the gravitational-wave (GW) signatures of detailed three-dimensional (3D) core-collapse supernova simulations and find that the f/g-mode and f-mode of protoneutron star oscillations carry away most of the GW power. The GW emission is mainly excited by accretion plumes onto the protoneutron star. The total GW emissions vary significantly among different stars and are correlated with the compactness of the progenitor.
