2023AJ....165...10E

Query : 2023AJ....165...10E

2023AJ....165...10E - Astron. J., 165, 10 (2023/January-0)

TOI 560: Two Transiting Planets Orbiting a K Dwarf Validated with iSHELL, PFS, and HIRES RVs.

EL MUFTI M., PLAVCHAN P.P., ISAACSON H., CALE B.L., FELIZ D.L., REEFE M.A., HELLIER C., STASSUN K., EASTMAN J., POLANSKI A., CROSSFIELD I.J.M., GAIDOS E., KOSTOV V., WITTROCK J.M., VILLASENOR J., SCHLIEDER J.E., BOUMA L.G., COLLINS K.I., ZOHRABI F., LEE R.A., SOHANI A., BERBERIAN J., VERMILION D., NEWMAN P., GENESER C., TANNER A., BATALHA N.M., DRESSING C., FULTON B., HOWARD A.W., HUBER D., KANE S.R., PETIGURA E.A., ROBERTSON P., ROY A., WEISS L.M., BEHMARD A., BEARD C., CHONTOS A., DAI F., DALBA P.A., FETHEROLF T., GIACALONE S., HILL M.L., HIRSCH L.A., HOLCOMB R., LUBIN J., MAYO A., MOCNIK T., MURPHY J.M.A., ROSENTHAL L.J., RUBENZAHL R.A., SCARSDALE N., STOCKDALE C., COLLINS K., CLOUTIER R., RELLES H., TAN T.-G., SCOTT N.J., HARTMAN Z., MATTHEWS E., CIARDI D.R., GONZALES E., MATSON R.A., BEICHMAN C., BIERYLA A., FURLAN E., GNILKA C.L., HOWELL S.B., ZIEGLER C., BRICENO C., LAW N., MANN A.W., RABUS M., JOHNSON M.C., CHRISTIANSEN J., KREIDBERG L., BERARDO D.A., DEMING D., GORJIAN V., MORALES F.Y., BENNEKE B., DRAGOMIR D., WITTENMYER R.A., BALLARD S., BOWLER B.P., HORNER J., KIELKOPF J., LIU H., SHPORER A., TINNEY C.G., ZHANG H., WRIGHT D.J., ADDISON B.C., MENGEL M.W. and OKUMURA J.

Abstract (from CDS):

We validate the presence of a two-planet system orbiting the 0.15-1.4 Gyr K4 dwarf TOI 560 (HD 73583). The system consists of an inner moderately eccentric transiting mini-Neptune (TOI 560 b, $P={6.3980661}_{-0.0000097}^{+0.0000095}$ days, $e={0.294}_{-0.062}^{+0.13}$, $M={0.94}_{-0.23}^{+0.31}{M}_{\mathrm{Nep}}$) initially discovered in the Sector 8 Transiting Exoplanet Survey Satellite (TESS) mission observations, and a transiting mini-Neptune (TOI 560 c, $P={18.8805}_{-0.0011}^{+0.0024}$ days, $M={1.32}_{-0.32}^{+0.29}{M}_{\mathrm{Nep}}$) discovered in the Sector 34 observations, in a rare near-1:3 orbital resonance. We utilize photometric data from TESS Spitzer, and ground-based follow-up observations to confirm the ephemerides and period of the transiting planets, vet false-positive scenarios, and detect the photoeccentric effect for TOI 560 b. We obtain follow-up spectroscopy and corresponding precise radial velocities (RVs) with the iSHELL spectrograph at the NASA Infrared Telescope Facility and the HIRES Spectrograph at Keck Observatory to validate the planetary nature of these signals, which we combine with published Planet Finder Spectrograph RVs from the Magellan Observatory. We detect the masses of both planets at >3σ significance. We apply a Gaussian process (GP) model to the TESS light curves to place priors on a chromatic RV GP model to constrain the stellar activity of the TOI 560 host star, and confirm a strong wavelength dependence for the stellar activity demonstrating the ability of near-IR RVs to mitigate stellar activity for young K dwarfs. TOI 560 is a nearby moderately young multiplanet system with two planets suitable for atmospheric characterization with the James Webb Space Telescope and other upcoming missions. In particular, it will undergo six transit pairs separated by <6 hr before 2027 June.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Radial velocity

Simbad objects: 18

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Number of rows : 18
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 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
3 NAME V1298 Tau b Pl 04 05 19.5909996648 +20 09 25.563233736           ~ 79 0
4 V* V1298 Tau TT* 04 05 19.5909996648 +20 09 25.563233736   11.11 10.12 9.57   K1 194 0
5 CD-26 2288 PM* 05 33 04.6005234792 -26 43 28.268361984   10.17 9.13     K3+Vk: 79 0
6 HD 73583c Pl 08 38 45.2603894280 -13 15 24.092462772           ~ 21 0
7 HD 73583b Pl 08 38 45.2603894280 -13 15 24.092462772           ~ 57 0
8 HD 73583 PM* 08 38 45.2603894280 -13 15 24.092462772   10.732 9.708 9.736   K4+Vk: 120 0
9 HD 75383 * 08 48 27.7540426176 -33 56 44.222874720   9.93 8.98     K0IV 5 0
10 G 161-32 PM* 09 28 41.5890982465 -12 09 55.752657397   13.70 12.262 11.899   M2.5V 35 0
11 NAME G 139-21b Pl 17 15 18.9339850845 +04 57 50.066612336           ~ 845 1
12 Kepler-132 Er* 18 52 56.5641599064 +41 20 34.997513460   12.49 11.92 11.768   G1 105 0
13 Kepler-411 Er* 19 10 25.3469947368 +49 31 23.712634632   13.70 12.55 12.26   K3V 129 0
14 Kepler-20 Er* 19 10 47.5233433920 +42 20 19.301370684   13.278 12.630 12.478 11.64 G5V 201 1
15 Kepler-51 Er* 19 45 55.1428629456 +49 56 15.650520684       14.829   G4 165 1
16 Kepler-89 Ro* 19 49 19.9343204784 +41 53 28.006017936           ~ 175 1
17 HD 197481b Pl 20 45 09.5324974119 -31 20 27.237889841           ~ 158 0
18 HD 197481 BY* 20 45 09.5324974119 -31 20 27.237889841   10.05 8.627 9.078 6.593 M1VeBa1 1344 0

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