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
Lokesh Mishra, Yann Alibert, Stephane Udry, Christoph Mordasini
Summary: In this paper, a model-independent framework for characterizing planetary system architecture at the system level is proposed. The formation pathways leading to four architecture classes are investigated using synthetic planetary systems. The study reveals the relationship between system architecture and initial conditions, as well as the influence of dynamical interactions and metallicity.
ASTRONOMY & ASTROPHYSICS
(2023)
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
Denggao Qiu, Fei Li, Jianguo Yan, Xianmin Wang, Wutong Gao, Qingyun Deng, Xi Guo
Summary: This study aims to redefine the extent and formation process of the cryptomare in the Balmer-Kapteyn region on the Moon. Through analysis of digital terrain models and mineralogy data, the study reveals the presence of ancient mare basalts and the origin of high-albedo materials in the region.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
E. Palle, J. Orell-Miquel, M. Brady, J. Bean, A. P. Hatzes, G. Morello, J. C. Morales, F. Murgas, K. Molaverdikhani, H. Parviainen, J. Sanz-Forcada, V. J. S. Bejar, J. A. Caballero, K. R. Sreenivas, M. Schlecker, I. Ribas, V. Perdelwitz, L. Tal-Or, M. Perez-Torres, R. Luque, S. Dreizler, B. Fuhrmeister, F. Aceituno, P. J. Amado, G. Anglada-Escude, D. A. Caldwell, D. Charbonneau, C. Cifuentes, J. P. de Leon, K. A. Collins, S. Dufoer, N. Espinoza, Z. Essack, A. Fukui, Y. Gomez Maqueo Chew, M. A. Gomez-Munoz, Th. Henning, E. Herrero, S. V. Jeffers, J. Jenkins, A. Kaminski, J. Kasper, M. Kunimoto, D. Latham, J. Lillo-Box, M. J. Lopez-Gonzalez, D. Montes, M. Mori, N. Narita, A. Quirrenbach, S. Pedraz, A. Reiners, E. Rodriguez, C. Rodriguez-Lopez, L. Sabin, N. Schanche, R-P Schwarz, A. Schweitzer, A. Seifahrt, G. Stefansson, J. Sturmer, T. Trifonov, S. Vanaverbeke, R. D. Wells, M. R. Zapatero-Osorio, M. Zechmeister
Summary: This study reports the discovery and mass determination of a planetary system around the M1.5 V star GJ 806 using data from multiple spectrographs and TESS. The system consists of a transiting planet with an ultra-short orbital period, as well as a non-transiting super-Earth planet. The study also suggests the possibility of a third planet or stellar activity.
ASTRONOMY & ASTROPHYSICS
(2023)
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
Tim D. Pearce, Ralf Launhardt, Robert Ostermann, Grant M. Kennedy, Mario Gennaro, Mark Booth, Alexander Krivov, Gabriele Cugno, Thomas K. Henning, Andreas Quirrenbach, Arianna Musso Barcucci, Elisabeth C. Matthews, Henrik L. Ruh, Jordan M. Stone
Summary: We have used debris discs to infer the properties of planets in 178 planetary systems. Our findings suggest that many wide-separation planets could exist, but they are currently undetectable. Our study also provides insights into the formation and evolution of planetary systems and identifies potential targets for future planet searches.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Alfred Curry, Amy Bonsor, Tim Lichtenberg, Oliver Shorttle
Summary: Short-lived radioisotopes, such as Al-26, played a crucial role in the formation of planetary bodies, providing additional heat source and leading to melting and iron core formation. The prevalence of these radioisotopes in exoplanetary systems is important for understanding volatile budget and atmospheric diversity. White dwarfs that have accreted planetary material offer a unique opportunity to study iron core formation in extrasolar planetesimals. Based on the evidence from white dwarfs, a significant fraction of exoplanetesimals are likely to have formed an iron core.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
S. Hoyer, J. S. Jenkins, V. Parmentier, M. Deleuil, G. Scandariato, T. G. Wilson, M. R. Diaz, I. J. M. Crossfield, D. Dragomir, T. Kataria, M. Lendl, R. Ramirez, P. A. Pena Rojas, J. I. Vines
Summary: This study aims to detect and characterize the optical secondary eclipse of the planet LTT 9779 b using CHEOPS, measuring the planetary albedo and searching for atmospheric condensates. By analyzing ten secondary eclipses, it is concluded that the planet has a geometric albedo of 0.80, similar to Venus, and likely has a super metal-rich atmosphere with silicate clouds. These findings provide the first steps towards understanding the atmospheric structure and physical processes of ultrahot Neptune worlds in the Neptune desert.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Andre Izidoro, Bertram Bitsch, Sean N. Raymond, Anders Johansen, Alessandro Morbidelli, Michiel Lambrechts, Seth A. Jacobson
Summary: Studies show that approximately 30% of main sequence stars host planets with sizes between 1 and 4 times Earth's radii and orbital periods less than 100 days. Through simulations and research, it is found that the formation of super-Earth systems may be related to factors such as pebble accretion, disk-planet tidal interactions, and usually result in multiple planetary systems.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
S. Hoyer, A. Bonfanti, A. Leleu, L. Acuna, L. M. Serrano, M. Deleuil, A. Bekkelien, C. Broeg, H-G Floren, D. Queloz, T. G. Wilson, S. G. Sousa, M. J. Hooton, V Adibekyan, Y. Alibert, R. Alonso, G. Anglada, J. Asquier, T. Barczy, D. Barrado, S. C. C. Barros, W. Baumjohann, M. Beck, T. Beck, W. Benz, N. Billot, F. Biondi, X. Bonfils, A. Brandeker, J. Cabrera, S. Charnoz, A. Collier Cameron, Sz Csizmadia, M. B. Davies, L. Delrez, O. D. S. Demangeon, B-O Demory, D. Ehrenreich, A. Erikson, A. Fortier, L. Fossati, M. Fridlund, D. Gandolfi, M. Gillon, M. Guedel, N. Hara, K. Heng, K. G. Isaak, J. M. Jenkins, L. L. Kiss, J. Laskar, D. W. Latham, A. Lecavelier des Etangs, M. Lendl, C. Lovis, A. Luntzer, D. Magrin, P. F. L. Maxted, V Nascimbeni, G. Olofsson, R. Ottensamer, I Pagano, E. Palle, C. M. Persson, G. Peter, D. Piazza, G. Piotto, D. Pollacco, R. Ragazzoni, N. Rando, H. Rauer, I Ribas, G. R. Ricker, S. Salmon, N. C. Santos, G. Scandariato, S. Seager, D. Segransan, A. E. Simon, A. M. S. Smith, M. Steller, Gy M. Szabo, N. Thomas, J. D. Twicken, S. Udry, V. Van Grootel, R. K. Vanderspek, N. A. Walton, K. Westerdorff, J. N. Winn
Summary: The HD 108236 system, originally detected with four small planets based on TESS data, was later found to host five small transiting planets with the addition of a fifth planet detected by CHEOPS. By using data from CHEOPS and TESS, the planetary system was characterized, resulting in improved values for the host star parameters and the confirmation of transit timing variations for two of the planets. Further monitoring of the transits, particularly for certain planets, is necessary to confirm observed variations and make HD 108236 a key system for studying formation and evolution processes.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Anna C. Childs, Jason H. Steffen
Summary: This study presents a fragmentation module and composition tracking code for the N-body code rebound. The simulation results show that increasing the expansion factor leads to a higher rate of mergers, resulting in planetary systems with more planets and larger orbits. Additionally, fragmentation enhances radial mixing and increases the average water mass fraction of the planets as the expansion factor increases.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Zewen Jiang, Wei Wang, Guo Chen, Fei Yan, Heather M. Cegla, Patricio Rojo, Yaqing Shi, Qinglin Ouyang, Meng Zhai, Yujuan Liu, Fei Zhao, Yuqin Chen
Summary: Transit spectroscopy is a commonly used technique to study the atmosphere of exoplanets. In this study, the transmission spectra of WASP-85Ab were obtained and Ha, Ca II, and Li I absorptions were tentatively detected.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Jonah T. Hansen, Luca Casagrande, Michael J. Ireland, Jane Lin
Summary: This study conducted a new analysis on the Kepler field, using a metallicity calibration and parameters derived from a Bayesian isochrone fitting algorithm to test trends related to exoplanets. The results showed that planets are more frequently found around stars with higher metallicity, and confirmed the existence of a gap in planetary radii distribution as well as a slight positive correlation with stellar mass. The study concludes that this method shows promise in deriving robust statistics of exoplanets, and anticipates that new spectrophotometry from Gaia DR3 will help overcome the small sample size limitation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Rosanna H. Tilbrook, Matthew R. Burleigh, Jean C. Costes, Samuel Gill, Louise D. Nielsen, Jose Vines, Didier Queloz, Simon T. Hodgkin, Hannah L. Worters, Michael R. Goad, Jack S. Acton, Beth A. Henderson, David J. Armstrong, David R. Anderson, Daniel Bayliss, Francois Bouchy, Joshua T. Briegal, Edward M. Bryant, Sarah L. Casewell, Alexander Chaushev, Benjamin F. Cooke, Philipp Eigmuller, Edward Gillen, Maximilian N. Gunther, Aleisha Hogan, James S. Jenkins, Monika Lendl, James McCormac, Maximiliano Moyano, Liam Raynard, Alexis M. S. Smith, Stephane Udry, Christopher A. Watson, Richard G. West, Peter J. Wheatley, Hannes Breytenbach, Ramotholo R. Sefako, Jessymol K. Thomas, Douglas R. Alves
Summary: The study reports the discovery of four new Hot Jupiters with NGTS, finding them to be potentially inflated but with underlying mechanisms poorly understood. Analysis suggests that including additional hyperparameters and an updated catalogue of Hot Jupiters could refine inflationary models, advancing understanding of the physical processes that lead to inflated planets.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)