2022MNRAS.511.1043W

Query : 2022MNRAS.511.1043W

2022MNRAS.511.1043W - Mon. Not. R. Astron. Soc., 511, 1043-1071 (2022/March-3)

A pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 characterized with CHEOPS.

WILSON T.G., GOFFO E., ALIBERT Y., GANDOLFI D., BONFANTI A., PERSSON C.M., COLLIER CAMERON A., FRIDLUND M., FOSSATI L., KORTH J., BENZ W., DELINE A., FLOREN H.-G., GUTERMAN P., ADIBEKYAN V., HOOTON M.J., HOYER S., LELEU A., MUSTILL A.J., SALMON S., SOUSA S.G., SUAREZ O., ABE L., AGABI A., ALONSO R., ANGLADA G., ASQUIER J., BARCZY T., BARRADO NAVASCUES D., BARROS S.C.C., BAUMJOHANN W., BECK M., BECK T., BILLOT N., BONFILS X., BRANDEKER A., BROEG C., BRYANT E.M., BURLEIGH M.R., BUTTU M., CABRERA J., CHARNOZ S., CIARDI D.R., CLOUTIER R., COCHRAN W.D., COLLINS K.A., COLON K.D., CROUZET N., CSIZMADIA S., DAVIES M.B., DELEUIL M., DELREZ L., DEMANGEON O., DEMORY B.-O., DRAGOMIR D., DRANSFIELD G., EHRENREICH D., ERIKSON A., FORTIER A., GAN T., GILL S., GILLON M., GNILKA C.L., GRIEVES N., GRZIWA S., GUDEL M., GUILLOT T., HALDEMANN J., HENG K., HORNE K., HOWELL S.B., ISAAK K.G., JENKINS J.M., JENSEN E.L.N., KISS L., LACEDELLI G., LAM K., LASKAR J., LATHAM D.W., LECAVELIER DES ETANGS A., LENDL M., LESTER K.V., LEVINE A.M., LIVINGSTON J., LOVIS C., LUQUE R., MAGRIN D., MARIE-SAINTE W., MAXTED P.F.L., MAYO A.W., McLEAN B., MECINA M., MEKARNIA D., NASCIMBENI V., NIELSEN L.D., OLOFSSON G., OSBORN H.P., OSBORNE H.L.M., OTTENSAMER R., PAGANO I., PALLE E., PETER G., PIOTTO G., POLLACCO D., QUELOZ D., RAGAZZONI R., RANDO N., RAUER H., REDFIELD S., RIBAS I., RICKER G.R., RIEDER M., SANTOS N.C., SCANDARIATO G., SCHMIDER F.-X., SCHWARZ R.P., SCOTT N.J., SEAGER S., SEGRANSAN D., SERRANO L.M., SIMON A.E., SMITH A.M.S., STELLER M., STOCKDALE C., SZABO G., THOMAS N., TING E.B., TRIAUD A.H.M.J., UDRY S., VAN EYLEN V., VAN GROOTEL V., VANDERSPEK R.K., VIOTTO V., WALTON N. and WINN J.N.

Abstract (from CDS):

We report the discovery and characterization of a pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 (TIC 79748331), initially detected in the Transiting Exoplanet Survey Satellite (TESS) photometry. To characterize the system, we performed and retrieved the CHaracterising ExOPlanets Satellite (CHEOPS), TESS, and ground-based photometry, the High Accuracy Radial velocity Planet Searcher (HARPS) high-resolution spectroscopy, and Gemini speckle imaging. We characterize the host star and determine T_eff, *_= 4734 ±67 K, R*=0.726±0.007 R☉, and M*=0.748±0.032 M☉. We present a novel detrending method based on point spread function shape-change modelling and demonstrate its suitability to correct flux variations in CHEOPS data. We confirm the planetary nature of both bodies and find that TOI-1064 b has an orbital period of Pb = 6.44387 ± 0.00003 d, a radius of Rb = 2.59 ± 0.04 R⊕, and a mass of M_ b_ = 13.5–1.8+1.7 M⊕, whilst TOI-1064 c has an orbital period of P_ c_ = 12.22657+0.00005–0.00004 d, a radius of Rc = 2.65 ± 0.04 R⊕, and a 3σ upper mass limit of 8.5 M⊕. From the high-precision photometry we obtain radius uncertainties of ∼1.6 per cent, allowing us to conduct internal structure and atmospheric escape modelling. TOI-1064 b is one of the densest, well-characterized sub-Neptunes, with a tenuous atmosphere that can be explained by the loss of a primordial envelope following migration through the protoplanetary disc. It is likely that TOI-1064 c has an extended atmosphere due to the tentative low density, however further radial velocities are needed to confirm this scenario and the similar radii, different masses nature of this system. The high-precision data and modelling of TOI-1064 b are important for planets in this region of mass-radius space, and it allow us to identify a trend in bulk density-stellar metallicity for massive sub-Neptunes that may hint at the formation of this population of planets.

Abstract Copyright: © The Author(s) 2022. Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): techniques: photometric - techniques: radial velocities - planets and satellites: composition - planets and satellites: detection - planets and satellites: interiors - stars: individual: (TOI-1064 (TIC 79748331, Gaia EDR3 6683371847364921088))

VizieR on-line data: <Available at CDS (J/MNRAS/511/1043): cheo*.dat traw*.dat tdet*.dat harps*.dat ctio*.dat saao*.dat ngts*.dat astep*.dat asassn.dat wasp.dat gems*.dat>

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 32

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Number of rows : 32
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-178d Pl 00 29 12.3029193648 -30 27 13.466857032           ~ 20 0
2 TOI-178c Pl 00 29 12.3029193648 -30 27 13.466857032           ~ 29 0
3 WT 2353 PM* 00 29 12.3029193648 -30 27 13.466857032   13.05 11.95     ~ 102 0
4 TOI-125c Pl 01 34 22.7341114800 -66 40 32.951081784           ~ 21 0
5 TOI-125 PM* 01 34 22.7341114800 -66 40 32.951081784   11.72 11.02     ~ 38 0
6 TOI-849b Pl 01 54 51.7040408544 -29 25 18.468394788           ~ 59 0
7 NAME L 231-32c Pl 04 33 39.7200127728 -51 57 22.435373160           ~ 45 0
8 * pi. Men c Pl 05 37 09.8868446714 -80 28 08.834553264           ~ 117 0
9 K2-180b Pl 08 25 51.3437842728 +10 14 49.060473144           ~ 18 0
10 BD+10 1799b Pl 08 26 27.8490900672 +10 04 49.334175156           ~ 27 0
11 NAME G 162-44c Pl 10 18 35.1372361341 -11 43 00.243355403           ~ 50 0
12 HD 108236 PM* 12 26 17.8919204184 -51 21 46.215656244   9.89 9.24     G5V 62 0
13 HD 119130b Pl 13 41 30.3033490344 -09 56 45.879437004           ~ 26 0
14 K2-110b Pl 13 49 23.8898803200 -12 17 04.123044132           ~ 35 0
15 NAME G 139-21b Pl 17 15 18.9339850845 +04 57 50.066612336           ~ 845 1
16 Kepler-26b Pl 18 59 45.8408222304 +46 33 59.437703052           ~ 62 1
17 Kepler-26c Pl 18 59 45.8408222304 +46 33 59.437703052           ~ 56 1
18 Kepler-411b Pl 19 10 25.3469947368 +49 31 23.712634632           ~ 59 0
19 CD-47 13059 PM* 19 44 00.9498094224 -47 33 41.746168584   12.030 10.954 10.729 10.01 ~ 23 0
20 CD-47 13059c Pl 19 44 00.9498094224 -47 33 41.746168584           ~ 6 0
21 CD-47 13059b Pl 19 44 00.9498094224 -47 33 41.746168584           ~ 10 0
22 Kepler-80 Er* 19 44 27.0200680656 +39 58 43.594100688   16.303 15.201 14.866   M0V 177 1
23 Kepler-80c Pl 19 44 27.0200680656 +39 58 43.594100688           ~ 50 1
24 Kepler-80b Pl 19 44 27.0200680656 +39 58 43.594100688           ~ 52 1
25 Kepler-107 Er* 19 48 06.7734610824 +48 12 30.964175676   13.330 12.639 12.448   ~ 116 0
26 Kepler-307c Pl 19 51 10.8252284400 +40 25 03.669502080           ~ 44 0
27 Kepler-223 Er* 19 53 16.4202435936 +47 16 46.308434088   16.209 15.570 15.78   ~ 192 1
28 Kepler-1659 Er* 19 53 29.7223329192 +40 37 06.379732380   15.866 14.991 14.869   ~ 50 0
29 Kepler-48c Pl 19 56 33.4161659688 +40 56 56.496876216           ~ 72 1
30 K2-66b Pl 22 06 06.4020754080 -10 42 41.421424716           ~ 23 0
31 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 1306 0
32 BD-00 4534b Pl 23 35 49.2850684896 +00 26 43.844566272           ~ 41 0

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