The HD 93963 A transiting system: A 1.04 d super-Earth and a 3.65 d sub-Neptune discovered by TESS and CHEOPS

被引：9

作者：

Serrano, L. M. ^{[1
]}

Gandolfi, D. ^{[1
]}

Hoyer, S. ^{[2
]}

Brandeker, A. ^{[3
]}

Hooton, M. J. ^{[4
]}

Sousa, S. ^{[5
]}

Murgas, F. ^{[6
,7
]}

Ciardi, D. R. ^{[8
]}

Howell, S. B. ^{[9
]}

Benz, W. ^{[4
,10
]}

Billot, N. ^{[11
]}

Floren, H-G ^{[3
,12
]}

Bekkelien, A. ^{[11
]}

Bonfanti, A. ^{[13
]}

Krenn, A. ^{[13
]}

Mustill, A. J. ^{[14
]}

Wilson, T. G. ^{[15
]}

Osborn, H. ^{[10
,16
,17
]}

Parviainen, H. ^{[6
,7
]}

Heidari, N. ^{[2
,18
,19
]}

Palle, E. ^{[6
,7
]}

Fridlund, M. ^{[20
,21
]}

Adibekyan, V ^{[5
]}

Fossati, L. ^{[13
]}

Deleuil, M. ^{[2
]}

Knudstrup, E. ^{[22
,23
]}

Collins, K. A. ^{[24
]}

Lam, K. W. F. ^{[25
]}

Grziwa, S. ^{[26
]}

Salmon, S. ^{[11
]}

Albrecht, S. H. ^{[22
]}

Alibert, Y. ^{[4
]}

Alonso, R. ^{[6
,7
]}

Anglada-Escude, G. ^{[27
,28
]}

Barczy, T. ^{[29
]}

Barrado y Navascues, D. ^{[30
]}

Barros, S. C. C. ^{[5
,31
]}

Baumjohann, W. ^{[13
]}

Beck, M. ^{[11
]}

Beck, T. ^{[4
]}

Bieryla, A. ^{[32
]}

Bonfils, X. ^{[33
]}

Boyd, P. T. ^{[34
]}

Broeg, C. ^{[4
,10
]}

Cabrera, J. ^{[25
]}

Charnoz, S. ^{[35
]}

Chazelas, B. ^{[11
]}

Christiansen, J. L. ^{[8
]}

Cameron, A. Collier ^{[15
]}

Cortes-Zuleta, P. ^{[2
]}

机构：

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

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

[3] Stockholm Univ, AlbaNova Univ Ctr, Dept Astron, S-10691 Stockholm, Sweden

[4] Univ Bern, Phys Inst, Gesell Str 6, CH-3012 Bern, Switzerland

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

[6] Inst Astrofis Canarias, Tenerife 38200, Spain

[7] Univ La Laguna ULL, Dept Astrofis, Tenerife 38206, Spain

[8] NASA Exoplanet Sci Inst Caltech IPAC, 1200 E Calif Blvd, Pasadena, CA 91125 USA

[9] NASA Ames Res Ctr, Space Sci & Astrobiol Div, M-S 245-6, Moffett Field, CA 94035 USA

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

[11] Univ Geneva, Observ Astron, Chemin Pegasi 51, Versoix, Switzerland

[12] Stockholm Univ, Dept Astron, S-10691 Stockholm, Sweden

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

[14] Lund Univ, Dept Astron & Theoret Phys, Lund Observ, Box 43, S-22100 Lund, Sweden

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

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

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

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

[19] Univ Nice Sophia Antipolis UNS, Observ La Cote Azur OCA, Lab JL Lagrange, CNRS, Campus Valrose, F-06108 Nice 2, France

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

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

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

[23] Nordic Opt Telescope, Rambla Jose Ana Fernandez Perez 7, Brena Baja 38711, Spain

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

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

[26] Univ Cologne, Rhein Inst Umweltforsch, Aachener Str 209, D-50931 Cologne, Germany

[27] CSIC, Inst Ciencies Espai ICE, Campus UAB,Can Magrans S-N, Bellaterra 08193, Spain

[28] Inst Estudis Espacials Catalunya IEEC, Barcelona 08034, Spain

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

[30] Ctr Astrobiol CSIC INTA, Dept Astrofis, ESAC Campus, Madrid 28692, Spain

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

[32] Harvard Smithsonian Ctr Astrophys, 60 Garden St,P-333,MS-16, Cambridge, MA 02138 USA

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

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

[35] Univ Paris, Inst Phys Globe Paris, CNRS, F-75005 Paris, France

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

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

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

[39] Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA

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

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

[42] Slovak Acad Sci, Astron Inst, Stellar Dept, Vysoke Tatry 05960, Slovakia

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

[44] MTA ELTE Exoplanet Res Grp, Szent Imre Hu 112, H-9700 Szombathely, Hungary

[45] MTA ELTE Lendulet Milky Way Res Grp, Szent Imre Hu 112, H-9700 Szombathely, Hungary

[46] Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria

[47] Univ Paris 06, Inst Astrophys Paris, UMR7095 CNRS, 98Bis Blvd Arago, F-75014 Paris, France

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

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

[50] European Space Res & Technol Ctr ESTEC, European Space Agcy ESA, Directorate Sci, Sci & Operat Dept,Sci Div SCI SC, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands

来源：

ASTRONOMY & ASTROPHYSICS | 2022年 / 667卷 / A&A期

基金：

新加坡国家研究基金会; 瑞士国家科学基金会; 欧洲研究理事会; 澳大利亚研究理事会;

关键词：

planets and satellites: detection; planets and satellites: fundamental parameters; instrumentation: photometers; instrumentation: spectrographs; methods: data analysis; LOW-MASS STARS; RADIAL-VELOCITY; PLANET CANDIDATES; ERROR-CORRECTION; STELLAR ACTIVITY; ADAPTIVE OPTICS; LIGHT CURVES; KEPLER; EXOPLANETS; ROTATION;

D O I：

10.1051/0004-6361/202243093

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the discovery of two small planets transiting HD 93963A (TOI-1797), a GOV star (M-* = 1.109 +/- 0.043M(circle dot), R-* = 1.043 +/- 0.009 R-circle dot) in a visual binary system. We combined TESS and CHEOPS space-borne photometry with MuSCAT 2 ground-based photometry, 'Alopeke and PHARO high-resolution imaging, TRES and FIES reconnaissance spectroscopy, and SOPHIE radial velocity measurements. We validated and spectroscopically confirmed the outer transiting planet HD 93963 A c, a sub-Neptune with an orbital period of P-c approximate to 3.65 d that was reported to be a TESS object of interest (TOI) shortly after the release of Sector 22 data. HD 93963 A c has amass of M-c = 19.2 +/- 4.1 M-circle plus and a radius of R-c = 3.228 +/- 0.059 R-circle plus, implying a mean density of rho(c) = 3.1 +/- 0.7 g cm(-3). The inner object, HD 93963 A b, is a validated 1.04 d ultra-short period (USP) transiting super-Earth that we discovered in the TESS light curve and that was not listed as a TOI, owing to the low significance of its signal (TESS signal-to-noise ratio approximate to 6.7, TESS + CHEOPS combined transit depth D-b = 141.5(-8.3)(+8.5) ppm). We intensively monitored the star with CHEOPS by performing nine transit observations to confirm the presence of the inner planet and validate the system. HD 93963 A b is the first small (R-b = 1.35 +/- 0.042 R-circle plus) USP planet discovered and validated by TESS and CHEOPS. Unlike planet c, HD 93963 Ab is not significantly detected in our radial velocities (M-b = 7.8 +/- 3.2 M-circle plus). The two planets are on either side of the radius valley, implying that they could have undergone completely different evolution processes. We also discovered a linear trend in our Doppler measurements, suggesting the possible presence of a long-period outer planet. With a V-band magnitude of 9.2, HD 93963 A is among the brightest stars known to host a USP planet, making it one of the most favourable targets for precise mass measurement via Doppler spectroscopy and an important laboratory to test formation, evolution, and migration models of planetary systems hosting ultra-short period planets.

引用

页数：25

共 25 条

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