2023MNRAS.523.3069O

Query : 2023MNRAS.523.3069O

2023MNRAS.523.3069O - Mon. Not. R. Astron. Soc., 523, 3069-3089 (2023/August-1)

Two warm Neptunes transiting HIP 9618 revealed by TESS and Cheops.

OSBORN H.P., NOWAK G., HEBRARD G., MASSERON T., LILLO-BOX J., PALLE E., BEKKELIEN A., FLOREN H.-G., GUTERMAN P., SIMON A.E., ADIBEKYAN V., BIERYLA A., BORSATO L., BRANDEKER A., CIARDI D.R., COLLIER CAMERON A., COLLINS K.A., EGGER J.A., GANDOLFI D., HOOTON M.J., LATHAM D.W., LENDL M., MATTHEWS E.C., TUSON A., ULMER-MOLL S., VANDERBURG A., WILSON T.G., ZIEGLER C., ALIBERT Y., ALONSO R., ANGLADA G., ARNOLD L., ASQUIER J., BARRADO Y NAVASCUES D., BAUMJOHANN W., BECK T., BELINSKI A.A., BENZ W., BIONDI F., BOISSE I., BONFILS X., BROEG C., BUCHHAVE L.A., BARCZY T., BARROS S.C.C., CABRERA J., CARDONA GUILLEN C., CARLEO I., CASTRO-GONZALEZ A., CHARNOZ S., CHRISTIANSEN J., CORTES-ZULETA P., CSIZMADIA S., DALAL S., DAVIES M.B., DELEUIL M., DELFOSSE X., DELREZ L., DEMORY B.-O., DUNLAVEY A.B., EHRENREICH D., ERIKSON A., FERNANDES R.B., FORTIER A., FORVEILLE T., FOSSATI L., FRIDLUND M., GILLON M., GOEKE R.F., GOLIGUZOVA M.V., GONZALES E.J., GUNTHER M.N., GUDEL M., HEIDARI N., HENZE C.E., HOWELL S., HOYER S., FREY J.I., ISAAK K.G., JENKINS J.M., KIEFER F., KISS L., KORTH J., MAXTED P.F.L., LASKAR J., LECAVELIER DES ETANGS A., LOVIS C., LUND M.B., LUQUE R., MAGRIN D., ALMENARA J.M., MARTIOLI E., MECINA M., MEDINA J.V., MOLDOVAN D., MORALES-CALDERON M., MORELLO G., MOUTOU C., MURGAS F., JENSEN E.L.N., NASCIMBENI V., OLOFSSON G., OTTENSAMER R., PAGANO I., PETER G., PIOTTO G., POLLACCO D., QUELOZ D., RAGAZZONI R., RANDO N., RAUER H., RIBAS I., RICKER G., DEMANGEON O.D.S., SMITH A.M.S., SANTOS N., SCANDARIATO G., SEAGER S., SOUSA S.G., STELLER M., SZABO G.M., SEGRANSAN D., THOMAS N., UDRY S., ULMER B., VAN GROOTEL V., VANDERSPEK R., WALTON N. and WINN J.N.

Abstract (from CDS):

HIP 9618 (HD 12572, TOI-1471, TIC 306263608) is a bright (G = 9.0 mag) solar analogue. TESS photometry revealed the star to have two candidate planets with radii of 3.9 ± 0.044 R⊕ (HIP 9618 b) and 3.343 ± 0.039 R⊕ (HIP 9618 c). While the 20.77291 d period of HIP 9618 b was measured unambiguously, HIP 9618 c showed only two transits separated by a 680-d gap in the time series, leaving many possibilities for the period. To solve this issue, CHEOPS performed targeted photometry of period aliases to attempt to recover the true period of planet c, and successfully determined the true period to be 52.56349 d. High-resolution spectroscopy with HARPS-N, SOPHIE, and CAFE revealed a mass of 10.0 ± 3.1M⊕ for HIP 9618 b, which, according to our interior structure models, corresponds to a $6.8\pm 1.4~{{\ \rm per\ cent}}$ gas fraction. HIP 9618 c appears to have a lower mass than HIP 9618 b, with a 3-sigma upper limit of <18M⊕. Follow-up and archival RV measurements also reveal a clear long-term trend which, when combined with imaging and astrometric information, reveal a low-mass companion ($0.08^{+0.12}_{-0.05} M_\odot$) orbiting at $26.0^{+19.0}_{-11.0}$ au. This detection makes HIP 9618 one of only five bright (K < 8 mag) transiting multiplanet systems known to host a planet with P > 50 d, opening the door for the atmospheric characterization of warm (Teq < 750 K) sub-Neptunes.

Abstract Copyright: © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): surveys - eclipses - occultations - planets and satellites: detection - binaries: spectroscopic

VizieR on-line data: <Available at CDS (J/MNRAS/523/3069): cheops.dat harpsnrv.dat sophierv.dat caferv.dat lco_mcd.dat lco_ctio.dat lco_saao.dat>

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 12572 MS* 02 03 37.0252967640 +21 16 51.112623468       8.8   G5 52 0
2 HD 12572b Pl 02 03 37.0252967640 +21 16 51.112623468           ~ 10 0
3 HD 12572c Pl 02 03 37.0252967640 +21 16 51.112623468           ~ 6 0
4 Gaia DR3 94468978202368768 * 02 03 37.0879275688 +21 16 51.562866404           ~ 1 0
5 HD 15906c Pl? 02 33 05.2824653629 -10 21 06.411379278           ~ 3 0
6 TOI-5678b Pl 03 09 32.2118130648 -34 11 53.149633152           ~ 10 0
7 HD 22946d Pl 03 39 16.7617744728 -42 45 45.185938812           ~ 9 0
8 TOI-2257 * 12 58 57.6816623624 +77 39 41.689782344   16.648 15.211 14.793   M3 9 0
9 BD+40 2790c Pl 14 29 34.2426073536 +39 47 25.543283496           ~ 22 0
10 HD 139139 PM* 15 37 06.2148672264 -19 08 33.084276144   10.389 9.84 9.47 9.654 G3/5V 21 0
11 HD 209458 V* 22 03 10.7727465312 +18 53 03.549393384   8.21 7.63     F9V 1193 1

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