The GAPS programme at TNG XL. A puffy and warm Neptune-sized planet and an outer Neptune-mass candidate orbiting the solar-type star TOI-1422

被引：9

作者：

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

Mancini, L. ^{[1
,3
,4
]}

Damasso, M. ^{[3
]}

Bonomo, A. S. ^{[3
]}

Sozzetti, A. ^{[3
]}

Nardiello, D. ^{[6
,7
]}

Biazzo, K. ^{[5
]}

Stognone, R. G. ^{[8
]}

Lillo-Box, J. ^{[9
]}

Lanza, A. F. ^{[14
]}

Poretti, E. ^{[18
,19
]}

Lissauer, J. J. ^{[35
,36
]}

Zeng, L. ^{[10
,11
]}

Bieryla, A. ^{[32
]}

Hebrard, G. ^{[21
,22
,23
]}

Basilicata, M. ^{[1
]}

Benatti, S. ^{[15
]}

Bignamini, A. ^{[12
]}

Borsa, F. ^{[18
]}

Claudi, R. ^{[7
]}

Cosentino, R. ^{[19
]}

Covino, E. ^{[13
]}

de Gurtubai, A. ^{[19
]}

Delfosse, X. ^{[24
]}

Desidera, S. ^{[7
]}

Dragomir, D. ^{[33
]}

Eastman, J. D. ^{[32
]}

Essack, Z. ^{[29
,31
]}

Fiorenzano, A. F. M. ^{[19
]}

Giacobbe, P. ^{[3
]}

Harutyunyan, A. ^{[19
]}

Heidari, N. ^{[6
,25
,26
]}

Hellier, C. ^{[39
]}

Jenkins, J. M. ^{[34
]}

Knapic, C. ^{[12
]}

Konig, P-C ^{[20
,21
,22
]}

Latham, D. W. ^{[32
]}

Magazzu, A. ^{[37
]}

Maggio, A. ^{[15
]}

Maldonado, J. ^{[15
]}

Micela, G. ^{[15
]}

Molinari, E. ^{[16
]}

Molinaro, M. ^{[12
]}

Morgan, E. H. ^{[28
,29
]}

Moutou, C. ^{[27
]}

Nascimbeni, V ^{[7
]}

Pace, E. ^{[2
]}

Pagano, I ^{[14
]}

Pedani, M. ^{[19
]}

Piotto, G. ^{[17
]}

机构：

[1] Univ Roma Tor Vergata, Dept Phys, Via Ric Sci 1, I-00133 Rome, Italy

[2] Univ Florence, Dept Phys & Astron, Largo Enrico Fermi 5, I-50125 Florence, Italy

[3] INAF Turin Astrophys Observ, Via Osservatorio 20, I-10025 Pino Torinese, Italy

[4] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[5] INAF Osservatorio Astron Roma, Via Frascati 33, I-00040 Monte Porzio Catone, RM, Italy

[6] Aix Marseille Univ, LAM, CNES, CNRS, Marseille, France

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

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

[9] Ctr Astrobiol, Dept Astrofis, ESAC Campus, Villanueva De La Canada 28692, Madrid, Spain

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

[11] Harvard Univ, Dept Earth & Planetary Sci, 20 Oxford St, Cambridge, MA 02138 USA

[12] INAF Osservatorio Astron Trieste, Via Tiepolo 11, I-34143 Trieste, Italy

[13] INAF Osservatorio Astron Capodimonte, Salita Moiariello 16, I-80131 Naples, Italy

[14] INAF Osservatorio Astrofis Catania, Via S Sofia 78, I-95123 Catania, Italy

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

[16] INAF Osservatorio Astron Cagliari, Via Sci 5, I-09047 Selargius, CA, Italy

[17] Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 2, I-35122 Padua, Italy

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

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

[20] European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany

[21] UPMC Paris 6, CNRS, UMR 7095, Inst Astrophys Paris, 98Bis Bd Arago, F-75014 Paris, France

[22] UPMC Paris 6, Sorbonne Univ, 98Bis Bd Arago, F-75014 Paris, France

[23] Univ Aix Marseille, Observ Haute Provence, CNRS, F-04870 St Michel lObservatoire, France

[24] Univ Grenoble Alpes, IPAG, CNRS, F-38000 Grenoble, France

[25] Shahid Beheshti Univ, Dept Phys, Tehran, Iran

[26] Univ Nice Sophia Antipolis, Lab JL Lagrange, CNRS, OCA, Campus Valrose, F-06108 Nice 2, France

[27] Univ Toulouse, CNES, IRAP, CNRS,UPS, F-31400 Toulouse, France

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

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

[30] NASA Goddard Space Flight Ctr, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA

[31] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA

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

[33] Univ New Mexico, Dept Phys & Astron, 210 Yale Blvd NE, Albuquerque, NM 87106 USA

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

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

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

[37] INAF Telescopio Nazl Galileo, Apartado 565, Santa Cruz De La Palma 38700, Spain

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

[39] Keele Univ, Astrophys Grp, Keele ST5 5BG, Staffs, England

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

来源：

ASTRONOMY & ASTROPHYSICS | 2022年 / 667卷

基金：

欧盟地平线“2020”;

关键词：

techniques: photometric; planetary systems; techniques: spectroscopic; techniques: radial velocities; stars: individual: TOI-1422; methods: data analysis; TRANSITING EXTRASOLAR PLANETS; HARPS-N; TRANSMISSION SPECTRUM; ERROR-CORRECTION; RADIUS VALLEY; SUPER-EARTHS; DETECTABILITY; SPECTROSCOPY; ARCHITECTURE; EMISSION;

D O I：

10.1051/0004-6361/202244079

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. Neptunes represent one of the main types of exoplanets and have chemical-physical characteristics halfway between rocky and gas giant planets. Therefore, their characterization is important for understanding and constraining both the formation mechanisms and the evolution patterns of planets. Aims. We investigate the exoplanet candidate TOI-1422 b, which was discovered by the TESS space telescope around the high proper-motion G2 V star TOI-1422 (V = 10.6 mag), 155 pc away, with the primary goal of confirming its planetary nature and characterising its properties. Methods. We monitored TOI-1422 with the HARPS-N spectrograph for 1.5 yr to precisely quantify its radial velocity (RV) variation. We analyse these RV measurements jointly with TESS photometry and check for blended companions through high-spatial resolution images using the AstraLux instrument. Results. We estimate that the parent star has a radius of R star = 1.019(-0.013)( )(+0.014)R(circle dot), and a mass of M star = 0.981(-0.065)(+0.062) M-circle dot. Our analysis confirms the planetary nature of TOI-1422 b and also suggests the presence of a Neptune-mass planet on a more distant orbit, the candidate TOI-1422 c, which is not detected in TESS light curves. The inner planet, TOI-1422 b, orbits on a period of P-b = 12.9972 +/- 0.0006 days and has an equilibrium temperature of T-e(q,b) = 867 +/- 17 K. With a radius of R-b = 3.96(-0.11)(+0.1)(3) R-circle plus, a mass of M-b = 9.0(-2.0)(+2.3) M-circle plus and, consequently, a density of rho(b) = 0.795(-0.2)(35)( )(+0.290)g cm(-3), it can be considered a warm Neptune-sized planet. Compared to other exoplanets of a similar mass range, TOI-1422 b is among the most inflated, and we expect this planet to have an extensive gaseous envelope that surrounds a core with a mass fraction around 10% - 25% of the total mass of the planet. The outer non-transiting planet candidate, TOI-1422 c, has an orbital period of P-c = 29.29(-0.)(20)(+0.21) days, a minimum mass, M-c sin i, of 11.1(-2.3)(+2.6) M-circle plus, an equilibrium temperature of T-eq,T-c = 661 +/- 13 K and, therefore, if confirmed, could be considered as another warm Neptune.

引用

页数：21

共 4 条

[1] The Activity of a Solar-Type Star TOI-1422 and Mass Loss of the Atmosphere of the Planet TOI-1422b
I. S. Savanov
Astronomy Reports, 2023, 67 : 719 - 724
[2] The Activity of a Solar-Type Star TOI-1422 and Mass Loss of the Atmosphere of the Planet TOI-1422b
Savanov, I. S.
ASTRONOMY REPORTS, 2023, 67 (07) : 719 - 724
[3] The GAPS programme at TNG LVII. TOI-5076b: A warm sub-Neptune planet orbiting a thin-to-thick-disk transition star in a wide binary system
Montalto, M.
Greco, N.
Biazzo, K.
Desidera, S.
Andreuzzi, G.
Bieryla, A.
Bignamini, A.
Bonomo, A. S.
Briceno, C.
Cabona, L.
Cosentino, R.
Damasso, M.
Fiorenzano, A.
Fong, W.
Goeke, B.
Hesse, K. M.
Kostov, V. B.
Lanza, A. F.
Latham, D. W.
Law, N.
Mancini, L.
Maggio, A.
Molinaro, M.
Mann, A. W.
Mantovan, G.
Naponiello, L.
Nardiello, D.
Nascimbeni, V.
Pagano, I.
Pedani, M.
Safonov, B. S.
Scandariato, G.
Seager, S.
Singh, V.
Sozzetti, A.
Strakhov, I. A.
Winn, J. N.
Ziegler, C.
Zingales, T.
ASTRONOMY & ASTROPHYSICS, 2024, 687
[4] 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
Mantovan, G.
Malavolta, L.
Desidera, S.
Zingales, T.
Borsato, L.
Piotto, G.
Maggio, A.
Locci, D.
Polychroni, D.
Turrini, D.
Baratella, M.
Biazzo, K.
Nardiello, D.
Stassun, K.
Nascimbeni, V.
Benatti, S.
John, A. Anna
Watkins, C.
Bieryla, A.
Lissauer, J. J.
Twicken, J. D.
Lanza, A. F.
Winn, J. N.
Messina, S.
Montalto, M.
Sozzetti, A.
Boffin, H.
Cheryasov, D.
Strakhov, I.
Murgas, F.
D'Arpa, M.
Barkaoui, K.
Benni, P.
Bignamini, A.
Bonomo, A. S.
Borsa, F.
Cabona, L.
Cameron, A. C.
Claudi, R.
Cochran, W.
Collins, K. A.
Damasso, M.
Dong, J.
Endl, M.
Fukui, A.
Furesz, G.
Gandolfi, D.
Ghedina, A.
Jenkins, J.
Kabath, P.
ASTRONOMY & ASTROPHYSICS, 2024, 682

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