Article
Multidisciplinary Sciences
J. W. Blackman, J. P. Beaulieu, D. P. Bennett, C. Danielski, C. Alard, A. A. Cole, A. Vandorou, C. Ranc, S. K. Terry, A. Bhattacharya, I Bond, E. Bachelet, D. Veras, N. Koshimoto, V Batista, J. B. Marquette
Summary: Studies have shown that remnants of destroyed planets and debris-disk planetesimals can survive the volatile evolution of host stars into white dwarfs, while intact planetary bodies around white dwarfs are rarely detected. This study reports the non-detection of a main-sequence lens star in a microlensing event, revealing a system with a 0.53 ± 0.11 solar mass white dwarf hosting a 1.4 ± 0.3 Jupiter-mass planet in Jupiter-like orbit, supporting the prediction that over half of white dwarfs have Jovian planetary companions.
Article
Engineering, Aerospace
Zhan Feng, Ming Xu, Kangkang Jian, Jian Li
Summary: Europa is an important target for exploring extraterrestrial life, and halo orbits are considered suitable locations for observation. However, halo orbits are naturally unstable and require stationkeeping. This study addresses the stationkeeping problem of halo orbits in the Jupiter-Europa system perturbed by the moon Io, assuming unknown mass and orbital rate of Io. A tight stationkeeping scheme is proposed, considering autonomous navigation and using estimated values of Io's mass and orbital rate to enhance control robustness and accuracy. The estimation accuracy is evaluated through Monte Carlo simulation.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Astronomy & Astrophysics
H. R. P. Jacome, M. S. Marques, P. Zarka, E. Echer, L. Lamy, C. K. Louis
Summary: The study aims to search for evidence of Europa's control over the Jovian decametric emission. Through analysis of the Nancay Decameter Array's digital catalog, 267 possible Europa-induced emissions were selected.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Geosciences, Multidisciplinary
J. D. Nichols, F. Allegrini, F. Bagenal, B. Bonfond, G. B. Clark, J. T. Clarke, J. E. P. Connerney, S. W. H. Cowley, R. W. Ebert, G. R. Gladstone, D. Grodent, D. K. Haggerty, B. Mauk, G. S. Orton, G. Provan, R. J. Wilson
Summary: This study compares Hubble Space Telescope observations of Jupiter's FUV auroras with Juno spacecraft observations in the equatorial middle magnetosphere of Jupiter, and shows that bright patches on the auroras are associated with magnetospheric convection and plasma injections.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
J. R. Szalay, H. T. Smith, E. J. Zirnstein, D. J. McComas, L. J. Begley, F. Bagenal, P. A. Delamere, R. J. Wilson, P. W. Valek, A. R. Poppe, Q. Nenon, F. Allegrini, R. W. Ebert, S. J. Bolton
Summary: Water-group gas continuously escapes from Jupiter's icy moons, forming co-orbiting populations of particles or neutral toroidal clouds. These clouds provide valuable information about their source moons, alter the composition of the local plasma, and act as sources and sinks for magnetospheric particles. The first observations of H-2(+) pickup ions in Jupiter's magnetosphere confirm the presence of a neutral H-2 toroidal cloud and provide insight into Europa's neutral loss rate.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
J. Rabia, V. Hue, J. R. Szalay, N. Andre, Q. Nenon, M. Blanc, F. Allegrini, S. J. Bolton, J. E. P. Connerney, R. W. Ebert, G. R. Gladstone, T. K. Greathouse, P. Louarn, A. Mura, E. Penou, A. H. Sulaiman
Summary: We characterized the precipitating electrons accelerated in the Europa-magnetosphere interaction through analyzing measurements recorded by Juno. The energy flux of the electrons showed an exponential decay as a function of downtail distance, and their characteristic energy decreased downtail. The electron distributions formed non-monotonic spectra in the near tail and became broadband in the far tail.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Yash Sarkango, James A. Slavin, Xianzhe Jia, Gina A. DiBraccio, Daniel J. Gershman, John E. P. Connerney, William S. Kurth, George B. Hospodarsky
Summary: Two small ion-inertial scale magnetic flux ropes were identified in the Juno magnetic field measurements in Jupiter's magnetotail. These structures could potentially play a significant role in mass loss through plasmoid ejection in the magnetosphere, highlighting the differences in magnetic reconnection processes between Jupiter and other magnetized planets like Earth and Mercury. Further studies are needed to fully understand the implications of these small-scale flux ropes on Jupiter's magnetospheric dynamics.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Guillaume Leseigneur, Jan Hendrik Bredehoeft, Thomas Gautier, Chaitanya Giri, Harald Krueger, Alexandra J. MacDermott, Uwe J. Meierhenrich, Guillermo M. Munoz Caro, Francois Raulin, Andrew Steele, Harald Steininger, Cyril Szopa, Wolfram Thiemann, Stephan Ulamec, Fred Goesmann
Summary: The Rosetta mission and the Philae lander have discovered a range of organic molecules in the nucleus of comet 67P/Churyumov-Gerasimenko. These volatile compounds represent the first raw materials present in the early Solar System.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Engineering, Aerospace
Ivan di Stefano, Paolo Cappuccio, Mauro Di Benedetto, Luciano Iess
Summary: The ESA's JUICE mission, scheduled for launch in April 2023, aims to study Jupiter and three of its moons. The mission includes performing experiments using the 3GM radio-science package, which has shown to estimate the value of gamma with high precision. This is significant for the study of general relativity.
ADVANCES IN SPACE RESEARCH
(2022)
Article
Astronomy & Astrophysics
Megan N. Barnett, Fred J. Ciesla
Summary: The study explores the effect of Jupiter's core on the solids it accumulates and suggests that its nitrogen enrichment indicates either formation in a more distant region of the solar nebula or suppressed loss of nitrogen.
ASTROPHYSICAL JOURNAL
(2022)
Article
Geosciences, Multidisciplinary
Dong-Xiao Pan, Zhong-Hua Yao, Harry Manners, William Dunn, Bertrand Bonfond, Denis Grodent, Bin-Zheng Zhang, Rui-Long Guo, Yong Wei
Summary: Large-scale electrical currents and Alfvenic waves are important drivers of planetary aurorae, with Alfvenic wave power potentially playing a significant role in driving Jupiter's aurorae as observed in this study. The correlation between ultralow-frequency waves in the magnetosphere and auroral activity suggests a strong connection between them, providing valuable insights into the mechanisms behind Jovian aurorae.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Astronomy & Astrophysics
Yujie Wang, Yabing Wang, Kai Tang, Dali Kong
Summary: This study summarizes the achievements of the Juno mission and discusses the need for improvement and definition of Jupiter's coordinate systems. Several magnetic field-related coordinate systems have been improved, and a simple, fast, and accurate transformation method has been proposed. The efficiency and accuracy of this work can serve as a fundamental tool for future Jovian system explorations.
EARTH AND SPACE SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Michael H. Wong, Philip S. Marcus, Amy A. Simon, Imke de Pater, Joshua W. Tollefson, Xylar Asay-Davis
Summary: The study found that the circularization of Jupiter's Great Red Spot cannot be explained by changes in the horizontal wind shear of the surrounding environment, but the average wind speeds in the high-speed ring increased by 4%-8% from 2009 to 2020. Changes in the wind field coincided with the South Equatorial Belt Outbreak storms of 2016-2017.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Review
Astronomy & Astrophysics
Leigh N. Fletcher, Thibault Cavalie, Davide Grassi, Ricardo Hueso, Luisa M. Lara, Yohai Kaspi, Eli Galanti, Thomas K. Greathouse, Philippa M. Molyneux, Marina Galand, Claire Vallat, Olivier Witasse, Rosario Lorente, Paul Hartogh, Francois Poulet, Yves Langevin, Pasquale Palumbo, G. Randall Gladstone, Kurt D. Retherford, Michele K. Dougherty, Jan-Erik Wahlund, Stas Barabash, Luciano Iess, Lorenzo Bruzzone, Hauke Hussmann, Leonid I. Gurvits, Ondrej Santolik, Ivana Kolmasova, Georg Fischer, Ingo Mueller-Wodarg, Giuseppe Piccioni, Thierry Fouchet, Jean-Claude Gerard, Agustin Sanchez-Lavega, Patrick G. J. Irwin, Denis Grodent, Francesca Altieri, Alessandro Mura, Pierre Drossart, Josh Kammer, Rohini Giles, Stephanie Cazaux, Geraint Jones, Maria Smirnova, Emmanuel Lellouch, Alexander S. Medvedev, Raphael Moreno, Ladislav Rezac, Athena Coustenis, Marc Costa
Summary: ESA's Jupiter Icy Moons Explorer (JUICE) will conduct a detailed investigation of the Jovian system in the 2030s, utilizing state-of-the-art instruments and a tailored orbital tour. The mission aims to gather information on the climate, meteorology, and chemistry of Jupiter's atmosphere and auroras, as well as studying phenomena on various timescales. The remote sensing payload includes spectroscopy, imaging, and sounding techniques, allowing for a comprehensive characterization of the planet's atmosphere and auroras.
SPACE SCIENCE REVIEWS
(2023)
Article
Engineering, Aerospace
Nathan J. Oborny, Florian Kehl, Vlad Cretu, Aaron C. Noell, Peter A. Willis
Summary: The group has developed an analytical method for amino acid analysis at low parts-per-billion levels and is working on a flight qualifiable laser-induced fluorescence detection system for potential future missions to Europa, which could experience total ionizing dose exposures of up to 300 krad.
Article
Astronomy & Astrophysics
K. W. F. Lam, J. Cabrera, M. J. Hooton, Y. Alibert, A. Bonfanti, M. Beck, A. Deline, H-G Floren, A. E. Simon, L. Fossati, C. M. Persson, M. Fridlund, S. Salmon, S. Hoyer, H. P. Osborn, T. G. Wilson, I. Y. Georgieva, Gr Nowak, R. Luque, J. A. Egger, V Adibekyan, R. Alonso, G. A. Escude, T. Barczy, D. Barrado, S. C. C. Barros, W. Baumjohann, T. Beck, A. Bekkelien, W. Benz, N. Billot, X. Bonfils, A. Brandeker, C. Broeg, S. Charnoz, A. C. Cameron, Sz Csizmadia, M. B. Davies, M. Deleuil, L. Delrez, O. D. S. Demangeon, B-O Demory, D. Ehrenreich, A. Erikson, A. Fortier, D. Futyan, D. Gandolfi, M. Gillon, M. Guedel, P. Guterman, J. Laskar, D. W. Latham, A. Lecavelier des Etangs, M. Lendl, C. Lovis, K. Heng, K. G. Isaak, L. Kiss, D. Magrin, P. F. L. Maxted, V Nascimbeni, G. Olofsson, R. Ottensamer, I Pagano, E. Palle, G. Peter, G. Piotto, D. Pollacco, D. Queloz, I Ribas, R. Ragazzoni, N. Rando, H. Rauer, N. C. Santos, G. Scandariato, S. Seager, D. Segransan, L. M. Serrano, A. M. S. Smith, S. G. Sousa, M. Steller, Gy M. Szabo, N. Thomas, S. Udry, V. Van Grootel, N. A. Walton, J. N. Winn
Summary: We have discovered a third planet in the TOI-1260 system, which is already known to have two transiting sub-Neptune planets. The discovery is supported by ground-based follow-up observations and precise photometric monitoring. The improved radius measurements provide valuable insights into the composition and interior structure of the planets.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
A. Bonfanti, D. Gandolfi, J. A. Egger, L. Fossati, J. Cabrera, A. Krenn, Y. Alibert, W. Benz, N. Billot, H. -G. Floren, M. Lendl, V. Adibekyan, S. Salmon, N. C. Santos, S. G. Sousa, T. G. Wilson, O. Barragan, A. Collier Cameron, L. Delrez, M. Esposito, E. Goffo, H. Osborne, H. P. Osborn, L. M. Serrano, V. Van Eylen, J. Alarcon, R. Alonso, G. Anglada, T. Barczy, D. Barrado Navascues, S. C. C. Barros, W. Baumjohann, M. Beck, T. Beck, M. Bedell, X. Bonfils, L. Borsato, A. Brandeker, C. Broeg, S. Charnoz, C. Corral Van Damme, Sz. Csizmadia, P. E. Cubillos, M. B. Davies, M. Deleuil, O. D. S. Demangeon, B. -o. Demory, D. Ehrenreich, A. Erikson, A. Fortier, M. Fridlund, M. Gillon, M. Gudel, S. Hoyer, K. G. Isaak, F. Kerschbaum, L. L. Kiss, J. Laskar, A. Lecavelier des Etangs, D. Lorenzo-Oliveira, C. Lovis, D. Magrin, L. Marafatto, P. F. L. Maxted, J. Melendez, C. Mordasini, V. Nascimbeni, G. Olofsson, R. Ottensamer, I. Pagano, E. Palle, G. Peter, D. Piazza, G. Piotto, D. Pollacco, D. Queloz, R. Ragazzoni, N. Rando, H. Rauer, I. Ribas, G. Scandariato, D. Segransan, A. E. Simon, A. M. S. Smith, M. Steller, Gy. M. Szabo, N. Thomas, S. Udry, B. Ulmer, V. Van Grootel, J. Venturini, N. A. Walton
Summary: In this study, the discrepancy in the published masses of the planet TOI-1055 b was resolved by extending the HARPS measurements and employing a new analysis tool. The precision of the planetary radius was improved through observations with the CHEOPS space telescope.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
A. Kessler, Y. Alibert
Summary: In the core accretion scenario of planet formation, the accretion of millimetre- to centimetre-sized pebbles allows for rapid core growth within the disk lifetime, while the accretion of kilometre-sized planetesimals often results in longer planet formation timescales. This study investigates the interplay between the two accretion processes in a disk containing both pebbles and planetesimals, and concludes that the late accretion of planetesimals is a critical factor in the giant planet formation process in hybrid pebble-planetesimal scenarios.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
V. Nascimbeni, L. Borsato, T. Zingales, G. Piotto, I. Pagano, M. Beck, C. Broeg, D. Ehrenreich, S. Hoyer, F. Z. Majidi, V. Granata, S. G. Sousa, T. G. Wilson, V. Van Grootel, A. Bonfanti, S. Salmon, A. J. Mustill, L. Delrez, Y. Alibert, R. Alonso, G. Anglada, T. Barczy, D. Barrado, S. C. C. Barros, W. Baumjohann, T. Beck, W. Benz, M. Bergomi, N. Billot, X. Bonfils, A. Brandeker, J. Cabrera, S. Charnoz, A. Collier Cameron, Sz. Csizmadia, P. E. Cubillos, M. B. Davies, M. Deleuil, A. Deline, O. D. S. Demangeon, B. -o. Demory, A. Erikson, A. Fortier, L. Fossati, M. Fridlund, D. Gandolfi, M. Gillon, M. Guedel, K. G. Isaak, L. L. Kiss, J. Laskar, A. Lecavelier des Etangs, M. Lendl, C. Lovis, R. Luque, D. Magrin, P. F. L. Maxted, C. Mordasini, G. Olofsson, R. Ottensamer, E. Palle, G. Peter, D. Piazza, D. Pollacco, D. Queloz, R. Ragazzoni, N. Rando, F. Ratti, H. Rauer, I. Ribas, N. C. Santos, G. Scandariato, D. Segransan, A. E. Simon, A. M. S. Smith, M. Steinberger, M. Steller, Gy. M. Szabo, N. Thomas, S. Udry, J. Venturini, N. A. Walton, D. Wolter
Summary: Among the known hot Jupiters, only a few have companions on short-period orbits. The architecture of WASP-47 is unique, with an HJ and multiple sub-Neptunian mass companions. This study analyzes new photometric data and improves the orbital ephemerides, providing important mass and density information for these planets.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Jonas Haldemann, Victor Ksoll, Daniel Walter, Yann Alibert, Ralf S. Klessen, Willy Benz, Ullrich Koethe, Lynton Ardizzone, Carsten Rother
Summary: Researchers propose using conditional invertible neural networks to calculate the posterior probability of planetary structure parameters, which can speed up the inference process for characterizing exoplanets. By training the neural network on a large database of internal structure models, they show that cINNs can infer the composition of an exoplanet much faster than the commonly used MCMC method. However, computing a large database is still required for training the network.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
A. Tuson, D. Queloz, H. P. Osborn, T. G. Wilson, M. J. Hooton, M. Beck, M. Lendl, G. Olofsson, A. Fortier, A. Bonfanti, A. Brandeker, L. A. Buchhave, A. Collier Cameron, D. R. Ciardi, K. A. Collins, D. Gandolfi, Z. Garai, S. Giacalone, J. Gomes da Silva, S. B. Howell, J. A. Patel, C. M. Persson, L. M. Serrano, S. G. Sousa, S. Ulmer-Moll, A. Vanderburg, C. Ziegler, Y. Alibert, R. Alonso, G. Anglada, T. Barczy, D. Barrado Navascues, S. C. C. Barros, W. Baumjohann, T. Beck, W. Benz, N. Billot, X. Bonfils, L. Borsato, C. Broeg, J. Cabrera, S. Charnoz, D. M. Conti, Sz. Csizmadia, P. E. Cubillos, M. B. Davies, M. Deleuil, L. Delrez, O. D. S. Demangeon, B-O. Demory, D. Dragomir, C. D. Dressing, D. Ehrenreich, A. Erikson, Z. Essack, J. Farinato, L. Fossati, M. Fridlund, E. Furlan, H. Gill, M. Gillon, C. L. Gnilka, E. Gonzales, M. Gudel, M. N. Gunther, S. Hoyer, K. G. Isaak, J. M. Jenkins, L. L. Kiss, J. Laskar, D. W. Latham, N. Law, A. Lecavelier des Etangs, G. Lo Curto, C. Lovis, R. Luque, D. Magrin, A. W. Mann, P. F. L. Maxted, M. Mayor, S. McDermott, M. Mecina, C. Mordasini, A. Mortier, V. Nascimbeni, R. Ottensamer, I. Pagano, E. Pallc, G. Peter, G. Piotto, D. Pollacco, T. Pritchard, R. Ragazzoni, N. Rando, F. Ratti, H. Rauer, I. Ribas, G. R. Ricker, M. Rieder, N. C. Santos, A. B. Savel, G. Scandariato, R. P. Schwarz, S. Seager, D. Segransan, A. Shporer, A. E. Simon, A. M. S. Smith, M. Steller, C. Stockdale, Gy. M. Szabo, N. Thomas, G. Torres, R. Tronsgaard, S. Udry, B. Ulmer, V. Van Grootel, R. Vanderspek, J. Venturini, N. A. Walton, J. N. Winn, B. Wohler
Summary: We report the discovery of two warm sub-Neptunes transiting the bright K-dwarf HD 15906. The inner planet, HD 15906 b, has a radius of 2.24 +/- 0.08 R-circle plus and a period of 10.924709 +/- 0.000032 days, while the outer planet, HD 15906 c, has a radius of 2.93(-0.06)(+0.07) R-circle plus and a period of 21.583298(-0.000055)(+0.000052) days. The HD 15906 system is one of only six multiplanet systems with two warm sub-Neptune sized planets transiting a bright star. It is an excellent target for detailed characterization studies to study planet formation and evolution.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Geochemistry & Geophysics
H. C. F. C. Hay, I. Fenty, R. T. Pappalardo, Y. Nakayama
Summary: Europa's geologically scarred surface suggests that its ice shell may have rotated nonsynchronously in the past. Oceanic currents beneath the ice can generate a previously unconsidered torque, which can either spin up or spin down the ice shell depending on convection strength. Simulations show that alternating east-west jets in the ocean produce a net torque on the ice shell, and a jet speed of at least 1 cm/s is necessary for the ice-ocean torque to be comparable to the tidal torque. Ocean currents may contribute to the nonsynchronous rotation of Europa's ice shell.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2023)
Article
Astronomy & Astrophysics
M. Fayolle, V. Lainey, D. Dirkx, L. I. Gurvits, G. Cimo, S. J. Bolton
Summary: This study demonstrates that performing VLBI tracking of an in-system spacecraft close to a stellar occultation can significantly improve the accuracy of the central planet's position. This method reduces the uncertainty in Jupiter's angular position to 250-400 m, allowing for better satellite ephemerides.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Jae-Young Kim, Tuomas Savolainen, Petr Voitsik, Evgeniya V. V. Kravchenko, Mikhail M. M. Lisakov, Yuri Y. Y. Kovalev, Hendrik Mueller, Andrei P. P. Lobanov, Kirill V. V. Sokolovsky, Gabriele Bruni, Philip G. G. Edwards, Cormac Reynolds, Uwe Bach, Leonid I. I. Gurvits, Thomas P. P. Krichbaum, Kazuhiro Hada, Marcello Giroletti, Monica Orienti, James M. Anderson, Sang-Sung Lee, Bong Won Sohn, J. Anton Zensus
Summary: We present the first 22 GHz space VLBI imaging observations of M87 by RadioAstron, which reveal substructures in the nucleus and suggest the presence of extreme Doppler boosting or efficient particle acceleration processes. These observations reach high angular and spatial resolutions, showing edge-brightened jet and counterjet structures and resolving the VLBI core region. The origin of the record-high brightness temperature in M87 is challenging to explain with current models.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
N. Nunes, N. Bartel, A. Belonenko, G. D. Manucharyan, S. M. Popov, V. N. Rudenko, L. Gurvits, G. Cimo, G. Molera Calves, M. Zakhvatkin, M. F. Bietenholz
Summary: This paper reports new results of measuring gravitational redshift with RadioAstron (RA) to validate the Einstein Equivalence Principle. By using a hydrogen maser frequency standard, the non-relativistic Doppler shift was corrected and ε = (2.1 +/- 3.3) x10(-4) was obtained. The study also discusses the potential of using time-domain recordings to reduce measurement uncertainties.
CLASSICAL AND QUANTUM GRAVITY
(2023)
Article
Astronomy & Astrophysics
H. P. Osborn, G. Nowak, G. Hebrard, T. Masseron, J. Lillo-Box, E. Palle, A. Bekkelien, H-G Floren, P. Guterman, A. E. Simon, V Adibekyan, A. Bieryla, L. Borsato, A. Brandeker, D. R. Ciardi, A. Collier Cameron, K. A. Collins, J. A. Egger, D. Gandolfi, M. J. Hooton, D. W. Latham, M. Lendl, E. C. Matthews, A. Tuson, S. Ulmer-Moll, A. Vanderburg, T. G. Wilson, C. Ziegler, Y. Alibert, R. Alonso, G. Anglada, L. Arnold, J. Asquier, D. Barrado y Navascues, W. Baumjohann, T. Beck, A. A. Belinski, W. Benz, F. Biondi, I Boisse, X. Bonfils, C. Broeg, L. A. Buchhave, T. Barczy, S. C. C. Barros, J. Cabrera, C. Cardona Guillen, I Carleo, A. Castro-Gonzalez, S. Charnoz, J. Christiansen, P. Cortes-Zuleta, S. Csizmadia, S. Dalal, M. B. Davies, M. Deleuil, X. Delfosse, L. Delrez, B-O Demory, A. B. Dunlavey, D. Ehrenreich, A. Erikson, R. B. Fernandes, A. Fortier, T. Forveille, L. Fossati, M. Fridlund, M. Gillon, R. F. Goeke, M. Goliguzova, E. J. Gonzales, M. N. Guenther, M. Guedel, N. Heidari, C. E. Henze, S. Howell, S. Hoyer, J. Frey, K. G. Isaak, J. M. Jenkins, F. Kiefer, L. Kiss, J. Korth, P. F. L. Maxted, J. Laskar, A. Lecavelier des Etangs, C. Lovis, M. B. Lund, R. Luque, D. Magrin, J. M. Almenara, E. Martioli, M. Mecina, J. Medina, D. Moldovan, M. Morales-Calderon, G. Morello, C. Moutou, F. Murgas, E. L. N. Jensen, V Nascimbeni, G. Olofsson, R. Ottensamer, I Pagano, G. Peter, G. Piotto, D. Pollacco, D. Queloz, R. Ragazzoni, N. Rando, H. Rauer, I Ribas, G. Ricker, O. D. S. Demangeon, A. M. S. Smith, N. Santos, G. Scandariato, S. Seager, S. G. Sousa, M. Steller, G. M. Szabo, D. Segransan, N. Thomas, S. Udry, B. Ulmer, V. Van Grootel, R. Vanderspek, N. Walton, J. N. Winn
Summary: HIP 9618 is a bright solar analogue with two candidate planets, HIP 9618 b and HIP 9618 c. Through targeted photometry and high-resolution spectroscopy, the true period of HIP 9618 c was determined to be 52.56349 days and the mass of HIP 9618 b was measured to be 10.0 +/- 3.1M(circle plus), while the mass of HIP 9618 c is estimated to be lower with an upper limit of <18M(circle plus).
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Geochemistry & Geophysics
Federico Tosi, Valentina Galluzzi, Alice Lucchetti, Roberto Orosei, Gianrico Filacchione, Francesca Zambon, Gabriele Cremonese, Pasquale Palumbo, Giuseppe Piccioni
Summary: This study focuses on the southern region of Ganymede, the largest moon of Jupiter, and provides a detailed geological analysis using high-resolution optical imagery and hyperspectral data. Two theoretical models are applied to infer the thickness of the ice shell and estimate radar clutter noise. The findings contribute to understanding the evolution history of the region and will be crucial for future exploration missions.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2023)
Article
Astronomy & Astrophysics
A. Moirano, A. Mura, B. Bonfond, J. E. P. Connerney, V. Dols, D. Grodent, V. Hue, J. C. Gerard, F. Tosi, A. Migliorini, A. Adriani, F. Altieri, C. Castagnoli, A. Cicchetti, B. M. Dinelli, D. Grassi, M. L. Moriconi, R. Noschese, G. Piccioni, C. Plainaki, P. Scarica, G. Sindoni, R. Sordini, D. Turrini, F. Zambon
Summary: One of the features of Jupiter's aurora is the emission caused by the orbital motion of its moon Io. The interaction between Io and the surrounding plasma generates Alfven waves that travel along the magnetic field lines towards Jupiter's ionosphere, causing the production of the Io footprint auroral emission. By studying the position of the Io footprint using JIRAM onboard Juno, researchers can retrieve information on the variability of the Io Plasma Torus and gain insights into the density and temperature variations. The results provide evidence of non-System III variability in the plasma density and temperature, suggesting either local time asymmetry or temporal variability of the torus.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Federico Tosi, Alessandro Mura, Alessandra Cofano, Francesca Zambon, Christopher R. Glein, Mauro Ciarniello, Jonathan I. Lunine, Giuseppe Piccioni, Christina Plainaki, Roberto Sordini, Alberto Adriani, Scott J. Bolton, Candice J. Hansen, Tom A. Nordheim, Alessandro Moirano, Livio Agostini, Francesca Altieri, Shawn M. Brooks, Andrea Cicchetti, Bianca Maria Dinelli, Davide Grassi, Alessandra Migliorini, Maria Luisa Moriconi, Raffaella Noschese, Pietro Scarica, Giuseppe Sindoni, Stefania Stefani, Diego Turrini
Summary: The surface of Ganymede exhibits diversity in composition, indicating geological age differences between dark and bright terrains. Recent high-resolution observations suggest the presence of hydrated sodium chloride, ammonium chloride, sodium/ammonium carbonate, and organic compounds, possibly originating from subsurface brines and reflecting water-rock interaction inside Ganymede.
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Engineering, Aerospace
Ben Hudson, Leonid I. Gurvits, Maciek Wielgus, Zsolt Paragi, Lei Liu, Weimin Zheng
Summary: Recent advances in technology and observational radio astronomy methods have enabled the direct imaging of a supermassive black hole. This achievement marks the beginning of the development of next-generation astronomical instruments with higher resolution. The study proposes a preliminary mission design for a spaceborne interferometer system to detect and analyze the features of supermassive black holes.