Year: 2019
Type: preprint
Abstract: Transiting extrasolar planets are key objects in the study of the formation, migration, and evolution of planetary systems. In particular, the exploration of the atmospheres of giant planets, through transmission spectroscopy or direct imaging, has revealed a large diversity in their chemical composition and physical properties. Studying these giant planets allows one to test the global climate models that are used for the Earth and other solar system planets. However, these studies are mostly limited either to highly-irradiated transiting giant planets or directly-imaged giant planets at large separations. Here we report the physical characterisation of the planets in a bright multi-planetary system (HIP41378) in which the outer planet, HIP41378 f is a Saturn-sized planet (9.2 $\pm$ 0.1 R$_\oplus$) with an anomalously low density of 0.09 $\pm$ 0.02 g cm$^{-3}$ that is not yet understood. Its equilibrium temperature is about 300 K. Therefore, it represents a planet with a mild temperature, in between the hot Jupiters and the colder giant planets of the Solar System. It opens a new window for atmospheric characterisation of giant exoplanets with a moderate irradiation, with the next-generation space telescopes such as JWST and ARIEL as well as the extremely-large ground-based telescopes. HIP41378 f is thus an important laboratory to understand the effect of the irradiation on the physical properties and chemical composition of the atmosphere of planets.
Source: arXiv (Cornell University)
Authors: Santerne, A., Malavolta, L., Kosiarek, M. R., Dai, F., Dressing, C. D., Dumusque, X., Hara, N. C., Lopez, T. A., Mortier, A., Vanderburg, A., Adibekyan, V., Armstrong, D. J., Barrado, D., Barros, S. C. C., Bayliss, D., Berardo, D., Boisse, I., Bonomo, A. S., Bouchy, F., Brown, D. J. A., Buchhave, L. A., Butler, R. P., Cameron, A. Collier, Cosentino, R., Crane, J. D., Crossfield, I. J. M., Damasso, M., Deleuil, M. R., Mena, E. Delgado, Demangeon, O., Díaz, R. F., Donati, J. -F., Figueira, P., Fulton, B. J., Ghedina, A., Harutyunyan, A., Hébrard, G., Hirsch, L. A., Hojjatpanah, S., Howard, A. W., Isaacson, H., Latham, D. W., Lillo-Box, J., López-Morales, M., Lovis, C., Fiorenzano, A. F. Martinez, Molinari, E., Mousis, O., Moutou, C., Nava, C., Nielsen, L. D., Osborn, H. P., Petigura, E. A., Phillips, D. F., Pollacco, D. L., Poretti, E., Rice, K., Santos, N. C., Ségransan, D., Shectman, S. A., Sinukoff, E., Sousa, S. G., Sozzetti, A., Teske, J. K., Udry, S., Vigan, A., Wang, S. X., Watson, C. A., Weiss, L. M., Wheatley, P. J., Winn, J. N.
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G1578567526, G303656407, Magnetic Fields and the Formation of New Worlds, G3893863535, WE PROPOSE TO USE TESS DATA TO INVESTIGATE PLANETARY SYSTEMS ORBITING COOL DWARFS SPANNING A RANGE OF MASSES METALLICITIES AND AGES. TESS WILL SURVEY 13 TIMES MORE COOL DWARFS THAN KEPLER AND K2 COMBINED THEREBY ENABLING SOPHISTICATED ANALYSES OF HOW THE PREVALENCE AND PROPERTIES OF PLANETS DEPEND ON HOST STAR CHARACTERISTICS. USING OUR PLANET DETECTION PIPELINE WE EXPECT TO DETECT ROUGHLY 90 EARTH-SIZED PLANETS 360 SUPER-EARTHS AND 1460 SUB-NEPTUNES IN THE FULL-FRAME IMAGES OF NEARLY 1 MILLION COOL DWARFS. MANY OF THESE WORLDS WILL BE INDIVIDUALLY INTERESTING AS TARGETS FOR FUTURE MASS MEASUREMENT OR ATMOSPHERIC CHARACTERIZATION AND PLANET OCCURRENCE CALCULATIONS USING THE FULL PLANET SAMPLE WILL REVEAL NEW INSIGHTS INTO THE FORMATION AND EVOLUTION OF PLANETARY SYSTEMS., G6645322944, G7187484686, Discovery of New Small, Cool Planets Orbiting M-Dwarf Stars
OpenAlex ID: W2990541286