2022A&A...658A.176H

Query : 2022A&A...658A.176H

2022A&A...658A.176H - Astronomy and Astrophysics, volume 658A176-176 (2022/2-1)

HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star.

HEIDARI N., BOISSE I., ORELL-MIQUEL J., HEBRARD G., ACUNA L., HARA N.C., LILLO-BOX J., EASTMAN J.D., ARNOLD L., ASTUDILLO-DEFRU N., ADIBEKYAN V., BIERYLA A., BONFILS X., BOUCHY F., BARCLAY T., BRASSEUR C.E., BORGNIET S., BOURRIER V., BUCHHAVE L., BEHMARD A., BEARD C., BATALHA N.M., COURCOL B., CORTES-ZULETA P., COLLINS K., CARMONA A., CROSSFIELD I.J.M., CHONTOS A., DELFOSSE X., DALAL S., DELEUIL M., DEMANGEON O.D.S., DIAZ R.F., DUMUSQUE X., DAYLAN T., DRAGOMIR D., DELGADO MENA E., DRESSING C., DAI F., DALBA P.A., EHRENREICH D., FORVEILLE T., FULTON B., FETHEROLF T., GAISNE G., GIACALONE S., RIAZI N., HOYER S., HOBSON M.J., HOWARD A.W., HUBER D., HILL M.L., HIRSCH L.A., ISAACSON H., JENKINS J., KANE S.R., KIEFER F., LUQUE R., LATHAM D.W., LUBIN J., LOPEZ T., MOUSIS O., MOUTOU C., MONTAGNIER G., MIGNON L., MAYO A., MOCNIK T., MURPHY J.M.A., PALLE E., PEPE F., PETIGURA E.A., REY J., RICKER G., ROBERTSON P., ROY A., RUBENZAHL R.A., ROSENTHAL L.J., SANTERNE A., SANTOS N.C., SOUSA S.G., STASSUN K.G., STALPORT M., SCARSDALE N., STROM P.A., SEAGER S., SEGRANSAN D., TENENBAUM P., TRONSGAARD R., UDRY S., VANDERSPEK R., VAKILI F., WINN J. and WEISS L.M.

Abstract (from CDS):

We present the discovery and characterization of a transiting sub-Neptune that orbits the nearby (28 pc) and bright (V = 8.37) K0V star HD 207897 (TOI-1611) with a 16.20-day period. This discovery is based on photometric measurements from the Transiting Exoplanet Survey Satellite mission and radial velocity (RV) observations from the SOPHIE, Automated Planet Finder, and HIRES high-precision spectrographs. We used EXOFASTv2 to model the parameters of the planet and its host star simultaneously, combining photometric and RV data to determine the planetary system parameters. We show that the planet has a radius of 2.50±0.08 RE and a mass of either 14.4±1.6 ME or 15.9±1.6 ME with nearly equal probability. The two solutions correspond to two possibilities for the stellar activity period. The density accordingly is either 5.1±0.7 g cm–3 or 5.5–0.7+0.85.5^{+0.8}_{-0.7}5.5-0.7+0.8 g cm–3, making it one of the relatively rare dense sub-Neptunes. The existence of this dense planet at only 0.12 AU from its host star is unusual in the currently observed sub-Neptune (2 < RE < 4) population. The most likely scenario is that this planet has migrated to its current position.

Abstract Copyright: © N. Heidari et al. 2022

Journal keyword(s): planets and satellites: detection - stars: activity - planets and satellites: individual: HD 207897 - planets and satellites: individual: TOI-1611 - planets and satellites: individual: TIC 264678534

Simbad objects: 15

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Number of rows : 15
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-849b Pl 01 54 51.7040408544 -29 25 18.468394788           ~ 59 0
2 HD 21749b Pl 03 26 59.2226447548 -63 29 56.762928961           ~ 49 0
3 TOI-700 PM* 06 28 23.2285331376 -65 34 45.520447908   14.524 13.076 12.659 10.70 M2V 84 0
4 K2-263b Pl 08 38 43.7696110488 +15 40 50.247016824           ~ 19 0
5 HD 119130b Pl 13 41 30.3033490344 -09 56 45.879437004           ~ 26 0
6 K2-110b Pl 13 49 23.8898803200 -12 17 04.123044132           ~ 35 0
7 TOI-1259 PM* 18 48 24.0699094456 +79 15 21.759912444   13.151 12.144 11.832   ~ 23 0
8 Kepler-10c Pl 19 02 43.0613892904 +50 14 28.701617339           ~ 135 1
9 Kepler-411b Pl 19 10 25.3469947368 +49 31 23.712634632           ~ 59 0
10 Kepler-538b Pl 19 49 56.8506739776 +49 37 24.358625580           ~ 46 0
11 UCAC4 872-008065 * 21 40 33.6456867446 +84 19 19.842451093           ~ 1 0
12 2MASS J21404093+8420197 * 21 40 40.8909588761 +84 20 19.747628695           ~ 1 0
13 HD 207897 MS* 21 40 44.7823068164 +84 20 00.565182174       7.9   K3 62 0
14 HD 207897b Pl 21 40 44.7823068164 +84 20 00.565182174           ~ 17 0
15 UCAC4 872-008072 * 21 40 52.5134572685 +84 20 01.097886316           ~ 1 0

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