2023MNRAS.523.3090T

Query : 2023MNRAS.523.3090T

2023MNRAS.523.3090T - Mon. Not. R. Astron. Soc., 523, 3090-3118 (2023/August-1)

TESS and CHEOPS discover two warm sub-Neptunes transiting the bright K-dwarf HD 15906.

TUSON A., QUELOZ D., OSBORN H.P., WILSON T.G., HOOTON M.J., BECK M., LENDL M., OLOFSSON G., FORTIER A., BONFANTI A., BRANDEKER A., BUCHHAVE L.A., COLLIER CAMERON A., CIARDI D.R., COLLINS K.A., GANDOLFI D., GARAI Z., GIACALONE S., GOMES DA SILVA J., HOWELL S.B., PATEL J.A., PERSSON C.M., SERRANO L.M., SOUSA S.G., ULMER-MOLL S., VANDERBURG A., ZIEGLER C., ALIBERT Y., ALONSO R., ANGLADA G., BARCZY T., BARRADO NAVASCUES D., BARROS S.C.C., BAUMJOHANN W., BECK T., BENZ W., BILLOT N., BONFILS X., BORSATO L., BROEG C., CABRERA J., CHARNOZ S., CONTI D.M., CSIZMADIA S., CUBILLOS P.E., DAVIES M.B., DELEUIL M., DELREZ L., DEMANGEON O.D.S., DEMORY B.-O., DRAGOMIR D., DRESSING C.D., EHRENREICH D., ERIKSON A., ESSACK Z., FARINATO J., FOSSATI L., FRIDLUND M., FURLAN E., GILL H., GILLON M., GNILKA C.L., GONZALES E., GUDEL M., GUNTHER M.N., HOYER S., ISAAK K.G., JENKINS J.M., KISS L.L., LASKAR J., LATHAM D.W., LAW N., LECAVELIER DES ETANGS A., LO CURTO G., LOVIS C., LUQUE R., MAGRIN D., MANN A.W., MAXTED P.F.L., MAYOR M., McDERMOTT S., MECINA M., MORDASINI C., MORTIER A., NASCIMBENI V., OTTENSAMER R., PAGANO I., PALLE E., PETER G., PIOTTO G., POLLACCO D., PRITCHARD T., RAGAZZONI R., RANDO N., RATTI F., RAUER H., RIBAS I., RICKER G.R., RIEDER M., SANTOS N.C., SAVEL A.B., SCANDARIATO G., SCHWARZ R.P., SEAGER S., SEGRANSAN D., SHPORER A., SIMON A.E., SMITH A.M.S., STELLER M., STOCKDALE C., SZABO G.M., THOMAS N., TORRES G., TRONSGAARD R., UDRY S., ULMER B., VAN GROOTEL V., VANDERSPEK R., VENTURINI J., WALTON N.A., WINN J.N. and WOHLER B.

Abstract (from CDS):

We report the discovery of two warm sub-Neptunes transiting the bright (G = 9.5 mag) K-dwarf HD 15906 (TOI 461, TIC 4646810). This star was observed by the Transiting Exoplanet Survey Satellite (TESS) in sectors 4 and 31, revealing two small transiting planets. The inner planet, HD 15906 b, was detected with an unambiguous period but the outer planet, HD 15906 c, showed only two transits separated by ∼ 734 d, leading to 36 possible values of its period. We performed follow-up observations with the CHaracterising ExOPlanet Satellite (CHEOPS) to confirm the true period of HD 15906 c and improve the radius precision of the two planets. From TESS, CHEOPS, and additional ground-based photometry, we find that HD 15906 b has a radius of 2.24 ± 0.08 R⊕ and a period of 10.924709 ± 0.000032 d, whilst HD 15906 c has a radius of 2.93$^{+0.07}_{-0.06}$ R⊕ and a period of 21.583298$^{+0.000052}_{-0.000055}$ d. Assuming zero bond albedo and full day-night heat redistribution, the inner and outer planet have equilibrium temperatures of 668 ± 13 K and 532 ± 10 K, respectively. The HD 15906 system has become one of only six multiplanet systems with two warm (≲ 700 K) sub-Neptune sized planets transiting a bright star (G ≤ 10 mag). It is an excellent target for detailed characterization studies to constrain the composition of sub-Neptune planets and test theories of planet formation and evolution.

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

Journal keyword(s): techniques: photometric - planets and satellites: detection - planets and satellites: fundamental parameters - stars: fundamental parameters - stars: individual: HD 15906 (TOI 461, TIC 4646810)

VizieR on-line data: <Available at CDS (J/MNRAS/523/3090): detrlc01.dat detrlc02.dat detrlc03.dat detrlc04.dat detrlc05.dat detrlc06.dat pipelc01.dat pipelc02.dat pipelc03.dat pipelc04.dat pipelc05.dat pipelc06.dat wasp_lc.dat>

Simbad objects: 23

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Number of rows : 23
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 PSO J038.2592-10.3450 * 02 33 02.2140714928 -10 20 42.063824687           ~ 1 0
3 HD 15906 PM* 02 33 05.2824651120 -10 21 06.411381228   10.79 9.76     K1/2V 47 0
4 HD 15906b Pl? 02 33 05.2824651120 -10 21 06.411381228           ~ 5 0
5 HD 15906c Pl? 02 33 05.2824653629 -10 21 06.411379278           ~ 3 0
6 HD 15914 * 02 33 14.9082785520 -10 22 42.900348828   10.54 10.00     F6/8V 5 0
7 V* DY Cet SB* 02 38 33.1803231456 -14 17 56.721878736   10.02 9.59 9.25 9.521 F5V 59 0
8 TOI-5678 PM* 03 09 32.2118130648 -34 11 53.149633152   12.03 11.44     G7V 10 0
9 TOI-5678b Pl 03 09 32.2118130648 -34 11 53.149633152           ~ 10 0
10 HD 21749b Pl 03 26 59.2226447548 -63 29 56.762928961           ~ 49 0
11 HD 22946d Pl 03 39 16.7617744728 -42 45 45.185938812           ~ 9 0
12 HD 22946 PM* 03 39 16.7617744728 -42 45 45.185938812   8.77 8.26     F7/8V 42 0
13 HD 23472c Pl 03 41 50.3987760888 -62 46 01.477226928           ~ 18 0
14 HD 23472 PM* 03 41 50.3987760888 -62 46 01.477226928   10.80 9.72     K3.5V 77 0
15 L 231-32 PM* 04 33 39.7200127728 -51 57 22.435373160     12.617 12.147   M3.0V 83 0
16 HD 73583c Pl 08 38 45.2603894280 -13 15 24.092462772           ~ 21 0
17 HD 108236 PM* 12 26 17.8919204184 -51 21 46.215656244   9.89 9.24     G5V 62 0
18 BD+40 2790c Pl 14 29 34.2426073536 +39 47 25.543283496           ~ 22 0
19 BD+40 2790 MS* 14 29 34.2426073536 +39 47 25.543283496   10.03 9.14     K0 55 0
20 * nu.02 Lup PM* 15 21 48.1499105161 -48 19 03.469906910 6.35 6.30 5.65     G2-V 354 1
21 * nu.02 Lup d Pl 15 21 48.1499105161 -48 19 03.469906910           ~ 24 1
22 BD+44 3020d Pl 18 56 14.3076037320 +44 31 05.389610412           ~ 62 1
23 HD 191939 MS* 20 08 05.7551464176 +66 51 02.076637068       8.5   G0 60 0

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