2022A&A...667A...1S

Query : 2022A&A...667A...1S

2022A&A...667A...1S - Astronomy and Astrophysics, volume 667A1-25 (2022/11-1)

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

SERRANO L.M., GANDOLFI D., HOYER S., BRANDEKER A., HOOTON M.J., SOUSA S., MURGAS F., CIARDI D.R., HOWELL S.B., BENZ W., BILLOT N., FLOREN H.-G., BEKKELIEN A., BONFANTI A., KRENN A., MUSTILL A.J., WILSON T.G., OSBORN H., PARVIAINEN H., HEIDARI N., PALLE E., FRIDLUND M., ADIBEKYAN V., FOSSATI L., DELEUIL M., KNUDSTRUP E., COLLINS K.A., LAM K.W.F., GRZIWA S., SALMON S., ALBRECHT S.H., ALIBERT Y., ALONSO R., ANGLADA-ESCUDE G., BARCZY T., BARRADO Y NAVASCUES D., BARROS S.C.C., BAUMJOHANN W., BECK M., BECK T., BIERYLA A., BONFILS X., BOYD P.T., BROEG C., CABRERA J., CHARNOZ S., CHAZELAS B., CHRISTIANSEN J.L., COLLIER CAMERON A., CORTES-ZULETA P., CSIZMADIA S., DAVIES M.B., DELINE A., DELREZ L., DEMANGEON O.D.S., DEMORY B.-O., DUNLAVEY A., EHRENREICH D., ERIKSON A., FORTIER A., FUKUI A., GARAI Z., GILLON M., GUDEL M., HEBRARD G., HENG K., HUANG C.X., ISAAK K.G., JENKINS J.M., KISS L.L., LASKAR J., LATHAM D.W., LECAVELIER DES ETANGS A., LENDL M., LEVINE A.M., LOVIS C., LUND M.B., MAGRIN D., MAXTED P.F.L., NARITA N., NASCIMBENI V., OLOFSSON G., OTTENSAMER R., PAGANO I., PESSANHA A.C.S.V., PETER G., PIOTTO G., POLLACCO D., QUELOZ D., RAGAZZONI R., RANDO N., RATTI F., RAUER H., RIBAS I., RICKER G., ROWDEN P., SANTOS N.C., SCANDARIATO G., SEAGER S., SEGRANSAN D., SIMON A.E., SMITH A.M.S., STELLER M., SZABO G.M., THOMAS N., TWICKEN J.D., UDRY S., ULMER B., VAN GROOTEL V., VANDERSPEK R., VIOTTO V. and WALTON N.

Abstract (from CDS):

We present the discovery of two small planets transiting HD 93963A (TOI-1797), a GOV star (M* = 1.109 ± 0.043M⊙, R* = 1.043 ± 0.009 R⊙) 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 Pc ≈ 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 Mc = 19.2 ± 4.1 M⊕ and a radius of Rc = 3.228 ± 0.059 R⊕, implying a mean density of ρc = 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 ≈6.7, TESS + CHEOPS combined transit depth Db = 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 (Rb = 1.35 ± 0.042 R⊕) USP planet discovered and validated by TESS and CHEOPS. Unlike planet c, HD 93963 Ab is not significantly detected in our radial velocities (Mb = 7.8 ± 3.2 M⊕). 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.

Abstract Copyright: © L. M. Serrano et al. 2022

Journal keyword(s): planets and satellites: detection - planets and satellites: fundamental parameters - instrumentation: photometers - instrumentation: spectrographs - methods: data analysis

VizieR on-line data: <Available at CDS (J/A+A/667/A1): drplc01.dat-drplc09.dat pipelc01.dat-pipelc09.dat detlc01.dat-detlc09.dat>

Simbad objects: 36

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Number of rows : 36
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 TOI-178c Pl 00 29 12.3029193648 -30 27 13.466857032           ~ 29 0
2 TOI-178f Pl 00 29 12.3029193648 -30 27 13.466857032           ~ 15 0
3 TOI-178b Pl 00 29 12.3029193648 -30 27 13.466857032           ~ 29 0
4 HD 3167 PM* 00 34 57.5242131960 +04 22 53.284093032       8.4   K0V 128 0
5 K2-106 PM* 00 52 19.1415736296 +10 47 40.906374828   12.58 12.10     ~ 61 0
6 TOI-849b Pl 01 54 51.7040408544 -29 25 18.468394788           ~ 59 0
7 K2-25b Pl 04 13 05.6131374072 +15 14 52.018080576           ~ 108 0
8 BD-14 1137 PM* 05 27 24.8258862552 -14 16 37.046186364   10.73 9.93     G9V 44 0
9 NGTS-4b Pl 05 58 23.7549496011 -30 48 42.363268864           ~ 47 0
10 CoRoT-7 * 06 43 49.4690164104 -01 03 46.826642700   12.78 11.73 11.36 10.87 K0V 232 1
11 CoRoT-7b Pl 06 43 49.4690164104 -01 03 46.826642700           ~ 422 1
12 CD-47 2804 PM* 07 06 13.9752770256 -47 35 13.872112260   11.5 10.59     K 48 0
13 * rho01 Cnc PM* 08 52 35.8111044043 +28 19 50.954994470 7.45 6.82   5.4   K0IV-V 1223 1
14 TOI-561 MS* 09 52 44.5491687624 +06 12 58.920960204   10.909 10.243 10.065   ~ 65 0
15 G 162-44 PM* 10 18 35.1372361341 -11 43 00.243355403   14.68 13.14 12.84   M4.0 98 0
16 2MASS J10505785+2537382 * 10 50 57.8292136372 +25 37 38.022708074           ~ 1 0
17 SDSS J105104.77+254015.6 * 10 51 04.7716856631 +25 40 15.684845415           ~ 1 0
18 HD 93963 MS* 10 51 06.5136673320 +25 38 28.189256748   9.77 9.18     G5 24 0
19 HD 93963c Pl 10 51 06.5136673320 +25 38 28.189256748           ~ 11 0
20 HD 93963b Pl 10 51 06.5136673320 +25 38 28.189256748           ~ 7 0
21 HD 93963B PM* 10 51 06.8665440454 +25 38 24.800476471           M5V 5 0
22 2MASS J10510735+2538368 * 10 51 07.3551125041 +25 38 36.751073278           ~ 1 0
23 SDSS J105108.01+253718.6 * 10 51 08.0116560886 +25 37 18.656721001           ~ 1 0
24 SDSS J105110.39+253734.2 * 10 51 10.3996082322 +25 37 34.326979774           ~ 1 0
25 HD 108236f Pl 12 26 17.8919204184 -51 21 46.215656244           ~ 5 0
26 BD-05 3504 PM* 12 27 29.5846968120 -06 43 18.766944228   12.05 10.98     G9 40 0
27 NAME SCR J1448-5735b Pl 14 48 39.8126986608 -57 35 17.557434564           ~ 28 0
28 Kepler-10 Em* 19 02 43.0613892904 +50 14 28.701617339       11.00   G2V 238 1
29 Kepler-407 Er* 19 04 08.7180702936 +49 36 52.219314504   13.601 12.664 12.508   G7 90 0
30 Kepler-42 PM* 19 28 52.5688740811 +44 37 08.989819665   17.8   16.06   M4V 131 1
31 Kepler-32 Er* 19 51 22.1744302704 +46 34 27.390583380       15.563   M1V 119 1
32 WASP-47 * 22 04 48.7261549272 -12 01 07.998743676     11.99 11.82   ~ 217 1
33 CD-44 14956b Pl 22 33 35.8684307688 -43 26 11.916565332           ~ 22 0
34 * 51 Peg b Pl 22 57 27.9804852576 +20 46 07.797040104           ~ 744 1
35 StKM 1-2122 PM* 23 23 39.9709098120 -01 11 21.448681332   12.14 11.45     K7V 61 0
36 CD-38 15670b Pl 23 54 40.2073116552 -37 37 40.524416508           ~ 79 0

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