2020AJ....160..179M


Query : 2020AJ....160..179M

2020AJ....160..179M - Astron. J., 160, 179-179 (2020/October-0)

TESS hunt for young and maturing exoplanets (THYME). III. A two-planet system in the 400 Myr Ursa Major group.

MANN A.W., JOHNSON M.C., VANDERBURG A., KRAUS A.L., RIZZUTO A.C., WOOD M.L., BUSH J.L., ROCKCLIFFE K., NEWTON E.R., LATHAM D.W., MAMAJEK E.E., ZHOU G., QUINN S.N., THAO P.C., BENATTI S., COSENTINO R., DESIDERA S., HARUTYUNYAN A., LOVIS C., MORTIER A., PEPE F.A., PORETTI E., WILSON T.G., KRISTIANSEN M.H., GAGLIANO R., JACOBS T., LACOURSE D.M., OMOHUNDRO M., SCHWENGELER H.M., TERENTEV I.A., KANE S.R., HILL M.L., RABUS M., ESQUERDO G.A., BERLIND P., COLLINS K.A., MURAWSKI G., SALLAM N.H., AITKEN M.M., MASSEY B., RICKER G.R., VANDERSPEK R., SEAGER S., WINN J.N., JENKINS J.M., BARCLAY T., CALDWELL D.A., DRAGOMIR D., DOTY J.P., GLIDDEN A., TENENBAUM P., TORRES G., TWICKEN J.D. and VILLANUEVA S.Jr

Abstract (from CDS):

Exoplanets can evolve significantly between birth and maturity, as their atmospheres, orbits, and structures are shaped by their environment. Young planets (<1 Gyr) offer an opportunity to probe the critical early stages of this evolution, where planets evolve the fastest. However, most of the known young planets orbit prohibitively faint stars. We present the discovery of two planets transiting HD 63433 (TOI 1726, TIC 130181866), a young Sun-like (M*=0.99±0.03) star. Through kinematics, lithium abundance, and rotation, we confirm that HD 63433 is a member of the Ursa Major moving group (τ = 414 ± 23 Myr). Based on the TESS light curve and updated stellar parameters, we estimate that the planet radii are 2.15 ± 0.10 R and 2.67 ± 0.12 R, the orbital periods are 7.11 and 20.55 days, and the orbital eccentricities are lower than about 0.2. Using High Accuracy Radial velocity Planet Searcher for the Northern hemisphere velocities, we measure the Rossiter-McLaughlin signal of the inner planet, demonstrating that the orbit is prograde. Since the host star is bright (V = 6.9), both planets are amenable to transmission spectroscopy, radial velocity measurements of their masses, and more precise determination of the stellar obliquity. This system is therefore poised to play an important role in our understanding of planetary system evolution in the first billion years after formation.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Young star clusters - Exoplanet evolution - Transits - Exoplanet astronomy - Stellar activity - Stellar rotation - Exoplanet dynamics

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 44

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Number of rows : 44
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME THA As* 00 00 -62.0           ~ 391 0
2 V* EZ Cet BY* 01 49 23.3505045594 -10 42 13.019336799 7.49 7.386 6.754 6.392 6.04 G3V 157 0
3 * chi Cet PM* 01 49 35.1031601 -10 41 11.067376 5.04 5.00 4.68 4.38 4.22 F0V 188 0
4 HD 17926 PM* 02 51 56.2464213292 -30 48 52.259083285   6.862 6.382     F6V 46 0
5 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3133 0
6 K2-25b Pl 04 13 05.6134710701 +15 14 52.013808246           ~ 41 0
7 HD 26923 PM* 04 15 28.8004956278 +06 11 12.699896698 6.910 6.860   5.9   G0IV 196 0
8 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2807 0
9 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1269 0
10 * pi. Men PM* 05 37 09.8851202601 -80 28 08.831347245   6.25 5.67     G0V 277 1
11 * gam Lep PM* 05 44 27.7908940 -22 26 54.180763 4.08 4.07 3.60 3.15 2.89 F6V 405 0
12 HD 59747 BY* 07 33 00.5803322465 +37 01 47.450630754   8.58 7.70     G5V 88 0
13 UCAC4 587-040618 * 07 49 51.0151784399 +27 20 44.424189278   16.258 15.622 15.453   ~ 1 0
14 HD 63433 BY* 07 49 55.0604326704 +27 21 47.458599312   7.59 6.91     G5IV 120 0
15 HD 63433c Pl? 07 49 55.0604326704 +27 21 47.458599312           ~ 7 0
16 HD 63433b Pl? 07 49 55.0604326704 +27 21 47.458599312           ~ 8 0
17 UCAC4 587-040628 * 07 50 01.4102584838 +27 20 38.785956437   14.198 13.625 13.608   ~ 1 0
18 NAME LP 424-4b Pl 07 59 05.8395618539 +15 23 29.240025256           ~ 211 1
19 K2-100 Ro* 08 38 24.3004849747 +20 06 21.828303951   11.085 10.521     G0V 76 0
20 * pi.01 UMa BY* 08 39 11.7043265307 +65 01 15.268273190 6.33 6.26 5.64 5.12 4.79 G0.5V 532 0
21 NGC 2632 OpC 08 40 13 +19 37.3           ~ 1344 0
22 * rho01 Cnc PM* 08 52 35.8113282132 +28 19 50.956901366 7.45 6.82   5.4   K0IV-V 1024 1
23 V* DS Leo BY* 11 02 38.3419263291 +21 58 01.704479733 12.246 11.049 9.572 8.638 7.634 M1.0V 194 0
24 HD 97658 PM* 11 14 33.1613362847 +25 42 37.391912066 9.049 8.569 7.714 7.259 6.835 K1V 146 1
25 Ross 905b Pl 11 42 11.0933874353 +26 42 23.658083337           ~ 674 1
26 V* NO UMa RS* 12 31 18.9199808163 +55 07 08.286582630   9.04 8.10     K2Ve 124 0
27 NAME Ursa Major Moving Group MGr 12 32 +57.0           ~ 402 2
28 V* DO CVn BY* 12 35 51.2878234258 +51 13 17.312165454   9.50 8.54     K0 48 0
29 HD 109799 gD* 12 37 42.2792849479 -27 08 19.985537552   5.736 5.410     F2IV 88 1
30 HD 110463 BY* 12 41 44.5224610977 +55 43 28.823352008   9.250 8.265     K3V 104 0
31 HD 111456 ** 12 48 39.4470003426 +60 19 11.037876361   6.299 5.831     F6V 196 1
32 * 78 UMa A PM* 13 00 43.6808824999 +56 21 58.860570790   5.39 5.02     ~ 6 0
33 HD 115043 PM* 13 13 37.0081498408 +56 42 29.762950141   7.423 6.813     G1Va 244 0
34 HD 238224 ** 13 23 23.2723798719 +57 54 21.821728551   10.91 9.560 9.355   K5V 60 0
35 NAME Ursa Major Cluster ClG 15 08.8 +67 07           ~ 398 0
36 BD-19 4086 * 15 21 55.1981390204 -20 13 53.987442974   11.81 10.88     K3 9 0
37 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1199 1
38 * zet TrA SB* 16 28 28.1396465547 -70 05 03.822057572   5.446 4.899     F9V 188 0
39 HD 165185 PM* 18 06 23.7191233830 -36 01 11.229463639 6.64 6.57 5.95 5.58   G1V 154 0
40 * 59 Dra PM* 19 09 09.8793494721 +76 33 37.808283506   5.400 5.107     A7V 120 1
41 HD 219134 Er* 23 13 16.9747821012 +57 10 06.076520993 7.460 6.560 5.570 4.76 4.23 K3V 547 1
42 HD 222259 RS* 23 39 39.48044 -69 11 44.7051     8.226   7.352 G6V+K3Ve 87 0
43 HD 222259Ab Pl 23 39 39.4809609959 -69 11 44.709342501           ~ 27 0
44 NAME Local Bubble ISM ~ ~           ~ 752 0

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2021.11.30-18:25:33

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