2021MNRAS.507.2782O

Query : 2021MNRAS.507.2782O

2021MNRAS.507.2782O - Mon. Not. R. Astron. Soc., 507, 2782-2803 (2021/October-3)

TOI-431/HIP 26013: a super-Earth and a sub-Neptune transiting a bright, early K dwarf, with a third RV planet.

OSBORN A., ARMSTRONG D.J., CALE B., BRAHM R., WITTENMYER R.A., DAI F., CROSSFIELD I.J.M., BRYANT E.M., ADIBEKYAN V., CLOUTIER R., COLLINS K.A., DELGADO MENA E., FRIDLUND M., HELLIER C., HOWELL S.B., KING G.W., LILLO-BOX J., OTEGI J., SOUSA S., STASSUN K.G., MATTHEWS E.C., ZIEGLER C., RICKER G., VANDERSPEK R., LATHAM D.W., SEAGER S., WINN J.N., JENKINS J.M., ACTON J.S., ADDISON B.C., ANDERSON D.R., BALLARD S., BARRADO D., BARROS S.C.C., BATALHA N., BAYLISS D., BARCLAY T., BENNEKE B., BERBERIAN J., BOUCHY F., BOWLER B.P., BRICENO C., BURKE C.J., BURLEIGH M.R., CASEWELL S.L., CIARDI D., COLLINS K.I., COOKE B.F., DEMANGEON O.D.S., DIAZ R.F., DORN C., DRAGOMIR D., DRESSING C., DUMUSQUE X., ESPINOZA N., FIGUEIRA P., FULTON B., FURLAN E., GAIDOS E., GENESER C., GILL S., GOAD M.R., GONZALES E.J., GORJIAN V., GUNTHER M.N., HELLED R., HENDERSON B.A., HENNING T., HOGAN A., HOJJATPANAH S., HORNER J., HOWARD A.W., HOYER S., HUBER D., ISAACSON H., JENKINS J.S., JENSEN E.L.N., JORDAN A., KANE S.R., KIDWELL R.C., KIELKOPF J., LAW N., LENDL M., LUND M., MATSON R.A., MANN A.W., McCORMAC J., MENGEL M.W., MORALES F.Y., NIELSEN L.D., OKUMURA J., OSBORN H.P., PETIGURA E.A., PLAVCHAN P., POLLACCO D., QUINTANA E.V., RAYNARD L., ROBERTSON P., ROSE M.E., ROY A., REEFE M., SANTERNE A., SANTOS N.C., SARKIS P., SCHLIEDER J., SCHWARZ R.P., SCOTT N.J., SHPORER A., SMITH A.M.S., STIBBARD C., STOCKDALE C., STROM P.A., TWICKEN J.D., TAN T.-G., TANNER A., TESKE J., TILBROOK R.H., TINNEY C.G., UDRY S., VILLASENOR J.N., VINES J.I., WANG S.X., WEISS L.M., WEST R.G., WHEATLEY P.J., WRIGHT D.J., ZHANG H. and ZOHRABI F.

Abstract (from CDS):

We present the bright (Vmag = 9.12), multiplanet system TOI-431, characterized with photometry and radial velocities (RVs). We estimate the stellar rotation period to be 30.5 ± 0.7 d using archival photometry and RVs. Transiting Exoplanet Survey Satellite (TESS) objects of Interest (TOI)-431 b is a super-Earth with a period of 0.49 d, a radius of 1.28 ± 0.04 R⊕, a mass of 3.07 ± 0.35 M⊕, and a density of 8.0 ± 1.0 g cm–3; TOI-431 d is a sub-Neptune with a period of 12.46 d, a radius of 3.29 ± 0.09 R⊕, a mass of 9.90+1.53–1.49 M⊕, and a density of 1.36 ± 0.25 g cm–3. We find a third planet, TOI-431 c, in the High Accuracy Radial velocity Planet Searcher RV data, but it is not seen to transit in the TESS light curves. It has an Msin i of 2.83+0.41–0.34 M⊕, and a period of 4.85 d. TOI-431 d likely has an extended atmosphere and is one of the most well-suited TESS discoveries for atmospheric characterization, while the super-Earth TOI-431 b may be a stripped core. These planets straddle the radius gap, presenting an interesting case-study for atmospheric evolution, and TOI-431 b is a prime TESS discovery for the study of rocky planet phase curves.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): planets and satellites: detection - planets and satellites: fundamental parameters - planets and satellites: individual: (TOI-431, TIC 31374837)

Simbad objects: 11

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Number of rows : 11
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 HD 3167 PM* 00 34 57.5242131960 +04 22 53.284093032       8.4   K0V 128 0
2 CD-26 2288 PM* 05 33 04.6005234792 -26 43 28.268361984   10.17 9.13     K3+Vk: 79 0
3 CD-26 2288c Pl 05 33 04.6005234792 -26 43 28.268361984           ~ 10 0
4 CD-26 2288b Pl 05 33 04.6005234792 -26 43 28.268361984           ~ 37 0
5 CD-26 2288d Pl 05 33 04.6005234792 -26 43 28.268361984           ~ 20 0
6 * rho01 Cnc PM* 08 52 35.8111044043 +28 19 50.954994470 7.45 6.82   5.4   K0IV-V 1223 1
7 Kepler-20 Er* 19 10 47.5233433920 +42 20 19.301370684   13.278 12.630 12.478 11.64 G5V 201 1
8 Kepler-36c Pl 19 25 00.0428079600 +49 13 54.630900876           ~ 133 1
9 Kepler-78 EB* 19 34 58.0137407208 +44 26 53.960186940   12.87 11.72     K2.5V 98 1
10 Kepler-11d Pl 19 48 27.6226218768 +41 54 32.903163504           ~ 131 1
11 WASP-47 * 22 04 48.7261549272 -12 01 07.998743676     11.99 11.82   ~ 217 1

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