TOI-757 b: an eccentric transiting mini-Neptune on a 17.5-d orbit

被引：1

作者：

Alqasim, A. ^{[1
]}

Grieves, N. ^{[2
]}

Rosario, N. M. ^{[3
,4
]}

Gandolfi, D. ^{[5
]}

Livingston, J. H. ^{[6
]}

Sousa, S. ^{[3
]}

Collins, K. A. ^{[7
]}

Teske, J. K. ^{[8
]}

Fridlund, M. ^{[9
,10
]}

Egger, J. A. ^{[11
]}

Cabrera, J. ^{[12
]}

Hellier, C. ^{[13
]}

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

Van Eylen, V. ^{[1
]}

Bouchy, F. ^{[2
]}

Oelkers, R. J. ^{[15
,16
]}

Srdoc, G. ^{[17
]}

Shectman, S. ^{[18
]}

Gunther, M. ^{[19
]}

Goffo, E. ^{[5
,20
]}

Wilson, T. ^{[21
]}

Serrano, L. M. ^{[5
]}

Brandeker, A. ^{[22
]}

Wang, S. X. ^{[23
]}

Heitzmann, A. ^{[24
]}

Bonfanti, A. ^{[25
]}

Fossati, L. ^{[25
]}

Alibert, Y. ^{[11
,26
]}

Delrez, L. ^{[27
,28
,29
]}

Sefako, R. ^{[30
]}

Barros, S. ^{[3
,4
]}

Collins, K., I ^{[31
]}

Demangeon, O. D. S. ^{[3
,4
]}

Albrecht, S. H. ^{[32
]}

Alonso, R. ^{[33
,34
]}

Asquier, J. ^{[19
]}

Barczy, T. ^{[35
]}

Barrado, D. ^{[36
]}

Baumjohann, W. ^{[25
]}

Beck, T. ^{[11
]}

Benz, W. ^{[11
,26
]}

Billot, N. ^{[2
]}

Borsato, L. ^{[37
]}

Broeg, C. ^{[11
,26
]}

Bryant, E. M. ^{[1
]}

Butler, R. P. ^{[8
]}

Cochran, W. D. ^{[38
,39
]}

Cameron, A. Collier ^{[40
]}

Correia, A. C. M. ^{[41
]}

Crane, J. D. ^{[18
]}

机构：

[1] UCL Mullard Space Sci Lab, Holmbury Hill Rd, Dorking RH5 6NT, Surrey, England

[2] Univ Geneva, Observ Geneve, 51 Chemin Pegasi, CH-1290 Versoix, Switzerland

[3] Univ Porto, Inst Astrofis & Ciencias Espaco, CAUP, Rua Estrelas, P-4150762 Porto, Portugal

[4] Univ Porto, Fac Ciencias, Dept Fis & Astron, Rua Campo Alegre, P-4169007 Porto, Portugal

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

[6] Univ Tokyo, Dept Astron, 7-3-1 Hongo,Bunkyo Ku, Tokyo 1130033, Japan

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

[8] Carnegie Inst Sci, Earth & Planets Lab, 5241 Broad Branch Rd NW, Washington, DC 20015 USA

[9] Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, SE-43992 Onsala, Sweden

[10] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

[11] Univ Bern, Weltraumforsch & Planetol, Phys Inst, Gesell Str 6, CH-3012 Bern, Switzerland

[12] German Aerosp Ctr DLR, Inst Planetary Res, Rutherfordstr 2, D-12489 Berlin, Germany

[13] Keele Univ, Astrophys Grp, Lennard Jones Bldg, Keele ST5 5BG, Staffs, England

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

[15] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA

[16] Univ Texas, Ctr Gravitat Wave Astron, Brownsville, TX 78520 USA

[17] Kotizarovci Observ, Sarsoni 90, Viskovo 51216, Croatia

[18] Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA

[19] European Space Res & Technol Ctr ESTEC, European Space Agcy ESA, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands

[20] Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany

[21] Graz Univ Technol, Inst Theoret Phys & Computat Phys, Petersgasse 16, A-8010 Graz, Austria

[22] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England

[23] Stockholm Univ, AlbaNova Univ Ctr, Dept Astron, SE-10691 Stockholm, Sweden

[24] Tsinghua Univ, Dept Astron, Beijing 100084, Peoples R China

[25] Univ Geneva, Observ Astron, Chemin Pegasi 51, CH-1290 Versoix, Switzerland

[26] Austrian Acad Sci, Space Res Inst, Schmiedlstr 6, A-8042 Graz, Austria

[27] Univ Bern, Ctr Space & Habitabil, Gesell Str 6, CH-3012 Bern, Switzerland

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

[29] Univ Liege, Space Sci Technol & Astrophys Res STAR Inst, Allee 6 Aout 19C, B-4000 Liege, Belgium

[30] Katholieke Univ Leuven, Inst Astron, Celestijnenlaan 200D, B-3001 Leuven, Belgium

[31] South African Astron Observ, POB 9, ZA-7935 Cape Town, South Africa

[32] George Mason Univ, Phys & Astron Dept, 4400 Univ Dr, Fairfax, VA 22030 USA

[33] Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark

[34] Inst Astrofis Canarias, Via Lactea S-N, E-38200 Tenerife, Spain

[35] Univ La Laguna ULL, Dept Astrofis, E-38206 Tenerife, Spain

[36] Admatis, 5 Kando Kalman St, H-3534 Miskolc, Hungary

[37] Ctr Astrobiol CSIC INTA, Dept Astrofis, ESAC Campus, E-28692 Villanueva De La Cariada, Madrid, Spain

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

[39] Univ Texas Austin, McDonald Observ, Austin, TX 78712 USA

[40] Univ Texas Austin, Ctr Planetary Syst Habitabil, Austin, TX 78712 USA

[41] Univ St Andrews, SUPA Sch Phys & Astron, Ctr Exoplanet Sci, St Andrews KY16 9SS, Fife, Scotland

[42] Univ Coimbra, Dept Phys, CFisUC, P-3004516 Coimbra, Portugal

[43] Osservatorio Astrofis Torino, INAF, Via Osservatorio 20, I-10025 To Pino Torinese, TO, Italy

[44] Lund Univ, Ctr Math Sci, Box 118, SE-22100 Lund, Sweden

[45] Washington Univ, Dept Phys, St Louis, MO 63130 USA

[46] Washington Univ, McDonnell Ctr Space Sci, St Louis, MO 63130 USA

[47] Aix Marseille Univ, LAM, CNES, CNRS, 38 Rue Frederic Joliot Curie, F-13388 Marseille, France

[48] Eotvos Lorand Univ, Gothard Astrophys Observ, Szent Imre Hu 112, H-9700 Szombathely, Hungary

[49] SRON Netherlands Inst Space Res, Niels Bohrweg 4, NL-2333 CA Leiden, Netherlands

[50] Univ Geneva, Fac Sci, Ctr Vie Univers, Quai Ernest Ansermet 30, CH-1211 Geneva 4, Switzerland

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2024年 / 533卷 / 01期

基金：

瑞典研究理事会; 欧洲研究理事会; 瑞士国家科学基金会; 奥地利科学基金会;

关键词：

techniques: photometric; techniques: radial velocities; planets and satellites: composition; planets and satellites: interiors; stars: individual: TOI-757 (TIC 130924120); POWERED MASS-LOSS; RADIUS DISTRIBUTION; SPECKLE INTERFEROMETRY; ERROR-CORRECTION; TIDAL EVOLUTION; I-ARCHITECTURE; TESS OBJECTS; SUPER-EARTHS; KEPLER; STARS;

D O I：

10.1093/mnras/stae1767

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the spectroscopic confirmation and fundamental properties of TOI-757 b, a mini-Neptune on a 17.5-d orbit transiting a bright star (V = 9.7 mag) discovered by the TESS mission. We acquired high-precision radial velocity measurements with the HARPS, ESPRESSO, and PFS spectrographs to confirm the planet detection and determine its mass. We also acquired space-borne transit photometry with the CHEOPS space telescope to place stronger constraints on the planet radius, supported with ground-based LCOGT photometry. WASP and KELT photometry were used to help constrain the stellar rotation period. We also determined the fundamental parameters of the host star. We find that TOI-757 b has a radius of R-p = 2.5 +/- 0.1 R-circle plus and a mass of M-p = 10.5(-2.1)(+2.2) M-circle plus, implying a bulk density of rho(p) = 3.6 +/- 0.8 g cm(-3). Our internal composition modelling was unable to constrain the composition of TOI-757 b, highlighting the importance of atmospheric observations for the system. We also find the planet to be highly eccentric with e = 0.39(-0.07)(+0.08), making it one of the very few highly eccentric planets among precisely characterized mini-Neptunes. Based on comparisons to other similar eccentric systems, we find a likely scenario for TOI-757 b's formation to be high eccentricity migration due to a distant outer companion. We additionally propose the possibility of a more intrinsic explanation for the high eccentricity due to star-star interactions during the earlier epoch of the Galactic disc formation, given the low metallicity and older age of TOI-757.

引用

页码：1 / 26

页数：26

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