Article
Astronomy & Astrophysics
Nick Choksi, Eugene Chiang
Summary: This study investigates gaps in protoplanetary discs suspected to be opened by planets. By analyzing observational data and simulations, it is found that the accretion rates of planets within these gaps and in the PDS 70 disc are consistent with the system age, indicating they may be undergoing their final mass doublings. The study also predicts gas surface densities for gaps without data and suggests that the accretion rates of the PDS 70 planets are much higher than previously estimated.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Jake T. Clark, Duncan J. Wright, Robert A. Wittenmyer, Jonathan Horner, Natalie R. Hinkel, Mathieu Clerte, Brad D. Carter, Sven Buder, Michael R. Hayden, Joss Bland-Hawthorn, Andrew R. Casey, Gayandhi M. De Silva, Valentina D'Orazi, Ken C. Freeman, Janez Kos, Geraint F. Lewis, Jane Lin, Karin Lind, Sarah L. Martell, Katharine J. Schlesinger, Sanjib Sharma, Jeffrey D. Simpson, Dennis Stello, Daniel B. Zucker, Tomaz Zwitter, Ulisse Munari, Thomas Nordlander
Summary: Pioneering surveys in photometric, astrometric, and spectroscopic area helped scientists better understand the fundamental properties of stars and their hosted planets. By analyzing data from GALAH Survey, Gaia satellite, and NASA's Exoplanet Archive, researchers refined the understanding of 279 exoplanet host stars and their planets. The study revealed that some planet candidates might actually be brown dwarfs or stellar companions and showed similarities in chemical properties between hot Neptune and hot rocky exoplanet hosts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
X. Guo, J. G. Yan, X. Yang, L. Liu, Y. H. Chen, M. Ye, J. P. Barriot
Summary: Doppler radio tracking data from Tianwen-1, China's first Mars mission, can help estimate the gravity field of Phobos. By considering additional flybys of Phobos by Tianwen-1 and Mars Express spacecraft, a determination up to degree and order 3 is feasible, and possibly degree and order 5. The cases of homogeneous, core-dominated, and mantle-dominated Phobos are studied, with the mantle-dominated case being the easiest to detect, followed by homogeneous and core-dominated cases. Implications for modeling the internal structure of Phobos are also discussed.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Georgina Dransfield, Mathilde Timmermans, Amaury H. M. J. Triaud, Martin Devora-Pajares, Christian Aganze, Khalid Barkaoui, Adam J. Burgasser, Karen A. Collins, Marion Cointepas, Elsa Ducrot, Maximilian N. Guenther, Steve B. Howell, Catriona A. Murray, Prajwal Niraula, Benjamin Rackham, Daniel Sebastian, Keivan G. Stassun, Sebastian Zuniga-Fernandez, Jose Manuel Almenara, Xavier Bonfils, Francois Bouchy, Christopher J. Burke, David Charbonneau, Jessie L. Christiansen, Laetitia Delrez, Tianjun Gan, Lionel J. Garcia, Michael Gillon, Yilen Gomez Maqueo Chew, Katharine M. Hesse, Matthew J. Hooton, Giovanni Isopi, Emmanuel Jehin, Jon M. Jenkins, David W. Latham, Franco Mallia, Felipe Murgas, Peter P. Pedersen, Francisco J. Pozuelos, Didier Queloz, David R. Rodriguez, Nicole Schanche, Sara Seager, Gregor Srdoc, Chris Stockdale, Joseph D. Twicken, Roland Vanderspek, Robert Wells, Joshua N. Winn, Julien de Wit, Aldo Zapparata
Summary: A study reports the discovery and validation of TOI-715 b, a planet orbiting an M4 host star, with characteristics placing it within the conservative habitable zone definition for rocky planets and between two measured locations of the M-dwarf radius valley. The study also reveals a second candidate planet in the system.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
N. Khorshid, M. Min, J. M. Desert
Summary: This study uses simulations to investigate the formation of WASP-77Ab and finds that the planet is likely formed in a disk with low planetesimal accretion. The most probable migration scenario is disk-free migration, starting within the CO ice line and ending beyond the water ice line.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Anna C. Childs, Cody Shakespeare, David R. Rice, Chao-Chin Yang, Jason H. Steffen
Summary: This study investigates the formation of the TRAPPIST-1 planetary system, exploring the composition and structure of the planets. The research shows that the inner two planets likely experienced giant impacts and are desiccated, while the outer planets have a primordial hydrosphere. Additionally, all planets are found to have a core in their interior structure.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
N. Rambaux, V Lainey, N. Cooper, L. Auzemery, Q. F. Zhang
Summary: This study focuses on the shape analysis of Saturn's small satellites, describing their global figure, large-scale topography, and deducing fundamental quantities, gravity field, and the amplitude of diurnal libration. The shape of the small satellites can be described with a confidence interval, and their topography and internal structure have been characterized. Comparison with other missions, such as Europa Clipper and JUICE could provide further insights into the internal satellites of Jupiter.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Felix A. Dannert, Maurice Ottiger, Sascha P. Quanz, Romain Laugier, Emile Fontanet, Adrian Gheorghe, Olivier Absil, Colin Dandumont, Denis Defrere, Carlos Gascon, Adrian M. Glauser, Jens Kammerer, Tim Lichtenberg, Hendrik Linz, Jerome Loicq
Summary: LIFEsim is a software tool developed for simulating observations of exoplanetary systems with an MIR space-based nulling interferometer. It provides an accessible way to predict the expected signal-to-noise ratio of future observations and highlights the power of the MIR wavelength range for deriving fundamental exoplanet properties from single-epoch observations.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Laurel Kaye, Shreyas Vissapragada, Maximilian N. Gunther, Suzanne Aigrain, Thomas Mikal-Evans, Eric L. N. Jensen, Hannu Parviainen, Francisco J. Pozuelos, Lyu Abe, Jack S. Acton, Abdelkrim Agabi, Douglas R. Alves, David R. Anderson, David J. Armstrong, Khalid Barkaoui, Oscar Barragan, Bjorn Benneke, Patricia T. Boyd, Rafael Brahm, Ivan Bruni, Edward M. Bryant, Matthew R. Burleigh, Sarah L. Casewell, David Ciardi, Ryan Cloutier, Karen A. Collins, Kevin Collins, Dennis M. Conti, Ian J. M. Crossfield, Nicolas Crouzet, Tansu Daylan, Diana Dragomir, Georgina Dransfield, Daniel Fabrycky, Michael Fausnaugh, Tianjun Gan, Samuel Gill, Michael Gillon, Michael R. Goad, Varoujan Gorjian, Michael Greklek-McKeon, Natalia Guerrero, Tristan Guillot, Emmanuel Jehin, J. S. Jenkins, Monika Lendl, Jacob Kamler, Stephen R. Kane, John F. Kielkopf, Michelle Kunimoto, Wenceslas Marie-Sainte, James McCormac, Djamel Mekarnia, Farisa Y. Morales, Maximiliano Moyano, Enric Palle, Vivien Parmentier, Howard M. Relles, Francois-Xavier Schmider, Richard P. Schwarz, S. Seager, Alexis M. S. Smith, Thiam-Guan Tan, Jake Taylor, Amaury H. M. J. Triaud, Joseph D. Twicken, Stephane Udry, J. Vines, Gavin Wang, Peter J. Wheatley, Joshua N. Winn
Summary: We studied the TOI-270 system, which consists of one super-Earth and two sub-Neptunes. Our observations revealed that the planets orbit near low-order mean-motion resonances and exhibit large transit timing variations. Through dynamical modeling and incorporating radial velocity observations, we obtained estimates of the masses and eccentricities of the planets, as well as information about their composition.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Luca Cacciapuoti, Laura Inno, Giovanni Covone, Veselin B. Kostov, Thomas Barclay, Elisa Quintana, Knicole D. Colon, Keivan G. Stassun, Benjamin Hord, Steven Giacalone, Stephen R. Kane, Kelsey Hoffman, Jason Rowe, Gavin Wang, Kevin Collins, Karen A. Collins, Thiam-Guan Tan, Francesco Gallo, Christian Magliano, Riccardo M. Ienco, Markus Rabus, David R. Ciardi, Elise Furlan, Steve B. Howell, Crystal L. Gnilka, Nicholas J. Scott, Kathryn Lester, Carl Ziegler, Cesar Briceno, Nicholas Law, Andrew W. Mann, Christopher J. Burke, Samuel N. Quinn, Angelo Ciaramella, Pasquale De Luca, Stefano Fiscale, Alessandra Rotundi, Livia Marcellino, Ardelio Galletti, Ida Bifulco, Fabrizio Oliva, Alton Spencer, Lisa Kaltenegger, Scott McDermott, Zahra Essack, Jon M. Jenkins, Bill Wohler, Joshua N. Winn, S. Seager, Roland Vanderspek, George Zhou, Avi Shporer, Diana Dragomir, William Fong
Summary: We report the discovery of a three-planet system around the bright, Sun-like star HD 22946. Two planets have been validated, and a third potential planet has been identified. The system is dynamically stable and may have room for additional planets. Further study of the star and its planets could provide valuable insights into their masses and atmospheres.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Oliver Voelkel, Rogerio Deienno, Katherine Kretke, Hubert Klahr
Summary: Pebble accretion during planetary formation significantly affects the formation of super-Earths in the inner region, but not in the outer region. Accretion of pebbles leads to the formation of fewer but more massive embryos, with the innermost embryos forming slightly earlier than those where pebble accretion is not considered.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
V. Van Eylen, N. Astudillo-Defru, X. Bonfils, J. Livingston, T. Hirano, R. Luque, K. W. F. Lam, A. B. Justesen, J. N. Winn, D. Gandolfi, G. Nowak, E. Palle, S. Albrecht, F. Dai, B. Campos Estrada, J. E. Owen, D. Foreman-Mackey, M. Fridlund, J. Korth, S. Mathur, T. Forveille, T. Mikal-Evans, H. L. M. Osborne, C. S. K. Ho, J. M. Almenara, E. Artigau, O. Barragan, S. C. C. Barros, F. Bouchy, J. Cabrera, D. A. Caldwell, D. Charbonneau, P. Chaturvedi, W. D. Cochran, S. Csizmadia, M. Damasso, X. Delfosse, J. R. De Medeiros, R. F. Diaz, R. Doyon, M. Esposito, G. Furesz, P. Figueira, I Georgieva, E. Goffo, S. Grziwa, E. Guenther, A. P. Hatzes, J. M. Jenkins, P. Kabath, E. Knudstrup, D. W. Latham, B. Lavie, C. Lovis, R. E. Mennickent, S. E. Mullally, F. Murgas, N. Narita, F. A. Pepe, C. M. Persson, S. Redfield, G. R. Ricker, N. C. Santos, S. Seager, L. M. Serrano, A. M. S. Smith, A. Suarez Mascareno, J. Subjak, J. D. Twicken, S. Udry, R. Vanderspek, M. R. Zapatero Osorio
Summary: This study reports precise Doppler measurements of L231-32, a nearby M dwarf hosting three transiting planets. The innermost planet may have a rocky composition similar to that of Earth, while the outer two planets have lower densities and are located on opposite sides of the radius valley.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
O. Carrion-Gonzalez, A. Garcia Munoz, N. C. Santos, J. Cabrera, Sz Csizmadia, H. Rauer
Summary: This study investigates the subset of exoplanets suitable for reflected starlight measurements using the Roman Space Telescope coronagraph, finding that in an optimistic scenario, 26 exoplanets are detectable, with the population biased towards more massive planets. The intermediate and pessimistic scenarios yield lower numbers of detectable exoplanets, highlighting the importance of inclination estimates for refining detectability prospects.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
J. M. Rodriguez-Mozos, A. Moya
Summary: This study estimates the internal structure and magnetic properties of dry and water-rich rocky planets using the Preliminary Reference Earth Model (PREM) as a reference. The model is applied to 176 planets confirmed by the TESS mission, and the results show remarkably low differences with observed values. TOI-700 d and TOI-2257 b are identified as the most interesting examples from an astrobiological perspective, located in the habitable zone.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
A. Bonfanti, L. Delrez, M. J. Hooton, T. G. Wilson, L. Fossati, Y. Alibert, S. Hoyer, A. J. Mustill, H. P. Osborn, V Adibekyan, D. Gandolfi, S. Salmon, S. G. Sousa, A. Tuson, V. Van Grootel, J. Cabrera, V Nascimbeni, P. F. L. Maxted, S. C. C. Barros, N. Billot, X. Bonfils, L. Borsato, C. Broeg, M. B. Davies, M. Deleuil, O. D. S. Demangeon, M. Fridlund, G. Lacedelli, M. Lendl, C. Persson, N. C. Santos, G. Scandariato, Gy M. Szabo, A. Collier Cameron, S. Udry, W. Benz, M. Beck, D. Ehrenreich, A. Fortier, K. G. Isaak, D. Queloz, R. Alonso, J. Asquier, T. Bandy, T. Barczy, D. Barrado, O. Barragan, W. Baumjohann, T. Beck, A. Bekkelien, M. Bergomi, A. Brandeker, M-D Busch, V Cessa, S. Charnoz, B. Chazelas, C. Corral Van Damme, B-O Demory, A. Erikson, J. Farinato, D. Futyan, A. Garcia Munoz, M. Gillon, M. Guedel, P. Guterman, J. Hasiba, K. Heng, E. Hernandez, L. Kiss, T. Kuntzer, J. Laskar, A. Lecavelier des Etangs, C. Lovis, D. Magrin, L. Malvasio, L. Marafatto, H. Michaelis, M. Munari, G. Olofsson, H. Ottacher, R. Ottensamer, I Pagano, E. Palle, G. Peter, D. Piazza, G. Piotto, D. Pollacco, R. Ragazzoni, N. Rando, F. Ratti, H. Rauer, I Ribas, M. Rieder, R. Rohlfs, F. Safa, M. Salatti, D. Segransan, A. E. Simon, A. M. S. Smith, M. Sordet, M. Steller, N. Thomas, M. Tschentscher, V. Van Eylen, V. Viotto, I Walter, N. A. Walton, F. Wildi, D. Wolter
Summary: The study characterizes the HD 108236 planetary system, improving transit ephemerides and system parameters using high-precision CHEOPS photometry. It confirms HD 108236 as a Sun-like star, reports the serendipitous detection of an additional planet, and analyzes the system's stability and planetary atmospheric evolution. The detection of the fifth planet makes HD 108236 the third system brighter than V = 10 mag to host more than four transiting planets, with significantly improved orbital ephemerides.
ASTRONOMY & ASTROPHYSICS
(2021)