The GAPS programme at TNG: XLIX. TOI-5398, the youngest compact multi-planet system composed of an inner sub-Neptune and an outer warm Saturn

被引：17

作者：

Mantovan, G. ^{[1
,2
]}

Malavolta, L. ^{[1
,2
]}

Desidera, S. ^{[2
]}

Zingales, T. ^{[1
,2
]}

Borsato, L. ^{[2
]}

Piotto, G. ^{[1
]}

Maggio, A. ^{[3
]}

Locci, D. ^{[3
]}

Polychroni, D. ^{[4
]}

Turrini, D. ^{[5
]}

Baratella, M. ^{[6
]}

Biazzo, K. ^{[7
]}

Nardiello, D. ^{[2
]}

Stassun, K. ^{[8
,9
]}

Nascimbeni, V. ^{[2
]}

Benatti, S. ^{[3
]}

John, A. Anna ^{[11
]}

Watkins, C. ^{[12
]}

Bieryla, A. ^{[12
]}

Lissauer, J. J. ^{[13
]}

Twicken, J. D. ^{[14
,15
]}

Lanza, A. F. ^{[16
]}

Winn, J. N. ^{[17
]}

Messina, S. ^{[16
]}

Montalto, M. ^{[16
]}

Sozzetti, A. ^{[5
]}

Boffin, H. ^{[18
]}

Cheryasov, D. ^{[19
]}

Strakhov, I. ^{[19
]}

Murgas, F. ^{[20
,21
]}

D'Arpa, M. ^{[3
]}

Barkaoui, K. ^{[20
,22
,23
]}

Benni, P. ^{[24
]}

Bignamini, A. ^{[4
]}

Bonomo, A. S. ^{[5
]}

Borsa, F. ^{[25
]}

Cabona, L. ^{[2
]}

Cameron, A. C. ^{[10
,11
]}

Claudi, R. ^{[2
,42
]}

Cochran, W. ^{[26
,27
,28
]}

Collins, K. A. ^{[12
]}

Damasso, M. ^{[5
]}

Dong, J. ^{[29
]}

Endl, M. ^{[26
,27
,28
]}

Fukui, A. ^{[20
,36
]}

Furesz, G. ^{[30
,31
]}

Gandolfi, D. ^{[44
]}

Ghedina, A. ^{[32
]}

Jenkins, J. ^{[14
]}

Kabath, P. ^{[33
]}

机构：

[1] Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy

[2] INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy

[3] INAF Osservatorio Astron Palermo, Piazza Parlamento 1, I-90134 Palermo, Italy

[4] INAF Osservatorio Astron Trieste, Via Giambattista Tiepolo 11, I-34131 Trieste, TS, Italy

[5] INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy

[6] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, Potsdam 14482, Germany

[7] INAF Osservatorio Astron Roma, Via Frascati 33, I-00078 Rome, Italy

[8] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[9] Fisk Univ, Dept Phys, Nashville, TN 37208 USA

[10] Univ St Andrews, SUPA, Sch Phys & Astron, St Andrews KY16 9SS, Scotland

[11] Univ St Andrews, Ctr Exoplanet Sci, St Andrews KY16 9SS, Scotland

[12] Harvard & Smithsonian, Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[13] Ames Res Ctr, Space Sci & Astrobiol Div, NASA, MS 245-3, Moffett Field, CA 94035 USA

[14] SETI Inst, Mountain View, CA 94043 USA

[15] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

[16] INAF Osservatorio Astrofis Catania, Oss Astr Catania, Via S Sofia 78, I-95123 Catania, Italy

[17] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[18] ESO, Karl Schwarzschild Str 2, D-85748 Garching, Germany

[19] Lomonosov Moscow State Univ, Sternberg Astron Inst, Moscow, Russia

[20] Inst Astrofis Canarias IAC, San Cristobal la Laguna 38205, Tenerife, Spain

[21] Univ La Laguna ULL, Dept Astrofis, Avd Astrofis Francisco Sanchez S-N, San Cristobal la Laguna 38206, Tenerife, Spain

[22] Univ Liege, Astrobiol Res Unit, 19C Allee 6 Aout, B-4000 Liege, Belgium

[23] MIT, Dept Earth Atmospher & Planetary Sci, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[24] Acton Sky Portal Private Observ, Acton, MA USA

[25] INAF Osservatorio Astron Brera, Via E Bianchi 46, I-23807 Merate, LC, Italy

[26] Univ Texas, Austin, TX USA

[27] Ctr Planetary Syst Habitabil, Austin, TX USA

[28] Univ Texas Austin, Austin, TX USA

[29] Flatiron Inst, Ctr Computat Astrophys, 162 Fifth Ave, New York, NY 10010 USA

[30] MIT, Dept Phys, Cambridge, MA 02139 USA

[31] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[32] Fdn Galileo Galilei INAF, Rambla Jose Ana Fernandez Perez 7, Brena Baja 38712, TF, Spain

[33] Czech Acad Sci, Astron Inst, Fricova 298, Ondrejov 25165, Czech Republic

[34] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA

[35] Wellesley Coll, Dept Astron, Wellesley, MA 02481 USA

[36] Univ Tokyo, Komaba Inst Sci, 3-8-1 Komaba,Meguro, Tokyo 1538902, Japan

[37] Astrobiol Ctr, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan

[38] Nicolaus Copernicus Univ, Inst Astron, Fac Phys Astron & Informat, Grudziadzka 5, PL-87100 Torun, Poland

[39] Royal Astron Soc, Burlington House, London W1J 0BQ, England

[40] MIT, Dept Aeronaut & Astronaut, 77 Massachusetts Ave, Cambridge, MA 02139 USA

[41] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, England

[42] Univ Roma Tre, Dipartimento Matemat & Fis, Via Vasca Navale 84, I-00146 Rome, Italy

[43] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA

[44] Univ Torino, Dipartimento Fis, Via Pietro Giuria 1, I-10125 Turin, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2024年 / 682卷

关键词：

planetary systems; planets and satellites: fundamental parameters; stars: fundamental parameters; stars: individual: BD+37 2118; techniques: photometric; techniques: radial velocities; planet-star interactions; HOT JUPITER SYSTEM; LOW-MASS STARS; HARPS-N; GIANT PLANETS; MAIN-SEQUENCE; CLOSE-IN; STELLAR PARAMETERS; EXTRASOLAR PLANETS; ERROR-CORRECTION; OPEN CLUSTERS;

D O I：

10.1051/0004-6361/202347472

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. Short-period giant planets (P less than or similar to 10 days, M-p >0.1 M-J) are frequently found to be solitary compared to other classes of exo-planets. Small inner companions to giant planets with P less than or similar to 15 days are known only in five compact systems: WASP-47, Kepler-730, WASP-132, TOI-1130, and TOI-2000. Here, we report the confirmation of TOI-5398, the youngest known compact multi-planet system composed of a hot sub-Neptune (TOI-5398 c, P-c = 4.77271 days) orbiting interior to a short-period Saturn (TOI-5398 b, P-b = 10.590547 days) planet, both transiting around a 650 +/- 150 Myr G-type star. Aims. As part of the Global Architecture of Planetary Systems (GAPS) Young Object project, we confirmed and characterised this compact system, measuring the radius and mass of both planets, thus constraining their bulk composition. Methods. Using multi-dimensional Gaussian processes, we simultaneously modelled stellar activity and planetary signals from the Transiting Exoplanet Survey Satellite (TESS) Sector 48 light curve and our High Accuracy Radial velocity Planet Searcher (HARPS-N) radial velocity (RV) time series. We confirmed the planetary nature of both planets, TOI-5398 b and TOI-5398 c, and obtained a precise estimation of their stellar parameters. Results. Through the use of astrometric, photometric, and spectroscopic observations, our findings indicate that TOI-5398 is a young, active G dwarf star (650 +/- 150 Myr) with a rotational period of P-rot = 7.34 days. The transit photometry and RV measurements enabled us to measure both the radius and mass of planets b, R-b = 10.30 +/- 0.40 R-circle plus, M-b = 58.7 +/- 5.7 M-circle plus, and c, R-c = 3.52 +/- 0.19 R-circle plus, M-c = 11.8 +/- 4.8 M-circle plus. TESS observed TOI-5398 during sector 48 and no further observations are planned in the current Extended Mission, making our ground-based light curves crucial for improvement of the ephemeris. With a transmission spectroscopy metric (TSM) value of around 300, TOI-5398 b is the most amenable warm giant (10 < P < 100 days) for JWST atmospheric characterisation.

引用

页数：29

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