2022A&A...666A.155C

Query : 2022A&A...666A.155C

2022A&A...666A.155C - Astronomy and Astrophysics, volume 666A155 (2022/10-1)

TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley.

CHATURVEDI P., BLUHM P., NAGEL E., HATZES A.P., MORELLO G., BRADY M., KORTH J., MOLAVERDIKHANI K., KOSSAKOWSKI D., CABALLERO J.A., GUENTHER E.W., PALLE E., ESPINOZA N., SEIFAHRT A., LODIEU N., CIFUENTES C., FURLAN E., AMADO P.J., BARCLAY T., BEAN J., BEJAR V.J.S., BERGOND G., BOYLE A.W., CIARDI D., COLLINS K.A., COLLINS K.I., ESPARZA-BORGES E., FUKUI A., GNILKA C.L., GOEKE R., GUERRA P., HENNING T., HERRERO E., HOWELL S.B., JEFFERS S.V., JENKINS J.M., JENSEN E.L.N., KASPER D., KODAMA T., LATHAM D.W., LOPEZ-GONZALEZ M.J., LUQUE R., MONTES D., MORALES J.C., MORI M., MURGAS F., NARITA N., NOWAK G., PARVIAINEN H., PASSEGGER V.M., QUIRRENBACH A., REFFERT S., REINERS A., RIBAS I., RICKER G.R., RODRIGUEZ E., RODRIGUEZ-LOPEZ C., SCHLECKER M., SCHWARZ R.P., SCHWEITZER A., SEAGER S., STEFANSSON G., STOCKDALE C., TAL-OR L., TWICKEN J.D., VANAVERBEKE S., WANG G., WATANABE D., WINN J.N. and ZECHMEISTER M.

Abstract (from CDS):

We report the discovery and characterization of two small transiting planets orbiting the bright M3.0V star TOI-1468 (LSPM J0106+1913), whose transit signals were detected in the photometric time series in three sectors of the TESS mission. We confirm the planetary nature of both of them using precise radial velocity measurements from the CARMENES and MAROON-X spectrographs, and supplement them with ground-based transit photometry. A joint analysis of all these data reveals that the shorter-period planet, TOI-1468 b (Pb = 1.88 d), has a planetary mass of Mb = 3.21 ± 0.24M⊕ and a radius of Rb = $1.280_{ - 0.039}^{ + 0.038}$R⊕, resulting in a density of ρb = $8.39_{ - 0.92}^{ + 1.05}$ g cm–3, which is consistent with a mostly rocky composition. For the outer planet, TOI-1468 c (Pc = 15.53 d), we derive a mass of Mc = $6.64_{ - 0.68}^{ + 0.67}$M⊕,aradius of Rc = 2.06 ± 0.04 R⊕, and a bulk density of ρc=$2.00_{ - 0.19}^{ + 0.21}$ g cm–3, which corresponds to a rocky core composition with a H/He gas envelope. These planets are located on opposite sides of the radius valley, making our system an interesting discovery as there are only a handful of other systems with the same properties. This discovery can further help determine a more precise location of the radius valley for small planets around M dwarfs and, therefore, shed more light on planet formation and evolution scenarios.

Abstract Copyright: © P. Chaturvedi et al. 2022

Journal keyword(s): techniques: photometric - techniques: radial velocities - stars: individual: TOI-1468 - stars: late-type

VizieR on-line data: <Available at CDS (J/A+A/666/A155): table2.dat tableb2.dat tableb3.dat>

Simbad objects: 16

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Number of rows : 16
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 3167b Pl 00 34 57.5242131960 +04 22 53.284093032           ~ 86 0
2 NAME G 268-38b Pl 00 44 59.3309137511 -15 16 17.542839990           ~ 237 0
3 K2-106b Pl 00 52 19.1415736296 +10 47 40.906374828           ~ 67 0
4 LSPM J0106+1913b Pl 01 06 36.9754315896 +19 13 33.163383396           ~ 21 0
5 NAME LSPM J0106+1913c Pl 01 06 36.9754315896 +19 13 33.163383396           ~ 16 0
6 LSPM J0106+1913 PM* 01 06 36.9754315896 +19 13 33.163383396       13.022   M3.0V 41 0
7 UCAC4 547-002111 * 01 06 37.6159722807 +19 13 38.473634870   14.425 13.240 14.020   ~ 1 0
8 NAME L 231-32b Pl 04 33 39.7200127728 -51 57 22.435373160           ~ 49 0
9 L 231-32 PM* 04 33 39.7200127728 -51 57 22.435373160     12.617 12.147   M3.0V 83 0
10 NAME L 320-124b Pl 10 14 51.7786855411 -47 09 24.192778106           ~ 223 0
11 NAME G 162-44b Pl 10 18 35.1372361341 -11 43 00.243355403           ~ 44 0
12 K2-36b Pl 11 17 47.7835701912 +03 51 59.005811016           ~ 24 0
13 K2-3 PM* 11 29 20.3917077216 -01 27 17.281697868   13.52 12.17 11.88   M1V 99 0
14 Wolf 437b Pl 12 47 56.6245693190 +09 45 05.035666747           ~ 95 0
15 PM J13119+6550 PM* 13 11 59.5600372848 +65 50 01.703045580   14.590 12.951 12.582   M3 47 0
16 BD-02 5958b Pl 23 27 04.8376907739 -01 17 10.582653030           ~ 78 0

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