J/AJ/165/85        THYME. IX. MELANGE-4 association members        (Wood+, 2023)

TESS Hunt for Young and Maturing Exoplanets (THYME). IX. A 27Myr Extended Population of Lower Centaurus Crux with a Transiting Two-planet System. Wood M.L., Mann A.W., Barber M.G., Bush J.L., Kraus A.L., Tofflemire B.M., Vanderburg A., Newton E.R., Feiden G.A., Zhou G., Bouma L.G., Quinn S.N., Armstrong D.J., Osborn A., Adibekyan V., Mena E.D., Sousa S.G., Gagne J., Fields M.J., Milburn R.P., Thao Pa C., Schmidt S.P., Gnilka C.L., Howell S.B., Law N.M., Ziegler C., Briceno C., Ricker G.R., Vanderspek R., Latham D.W., Seager S., Winn J.N., Jenkins J.M., Schlieder J.E., Osborn H.P., Twicken J.D., Ciardi D.R., Huang C.X. <Astron. J., 165, 85 (2023)> =2023AJ....165...85W 2023AJ....165...85W
ADC_Keywords: Associations, stellar; Spectra, optical; Radial velocities Keywords: Stellar ages ; Transit photometry ; Exoplanets ; Stellar associations ; Stellar kinematics Abstract: We report the discovery and characterization of a nearby (∼85pc), older (27±3Myr), distributed stellar population near Lower Centaurus Crux (LCC), initially identified by searching for stars comoving with a candidate transiting planet from TESS (HD109833; TOI1097). We determine the association membership using Gaia kinematics, color-magnitude information, and rotation periods of candidate members. We measure its age using isochrones, gyrochronology, and Li depletion. While the association is near known populations of LCC, we find that it is older than any previously found LCC subgroup (10-16Myr), and distinct in both position and velocity. In addition to the candidate planets around HD109833, the association contains four directly imaged planetary-mass companions around three stars, YSES-1, YSES-2, and HD95086, all of which were previously assigned membership in the younger LCC. Using the Notch pipeline, we identify a second candidate transiting planet around HD109833. We use a suite of ground-based follow-up observations to validate the two transit signals as planetary in nature. HD109833 b and c join the small but growing population of <100Myr transiting planets from TESS. HD109833 has a rotation period and Li abundance indicative of a young age (≲100Myr), but a position and velocity on the outskirts of the new population, lower Li levels than similar members, and a color-magnitude diagram position below model predictions for 27Myr. So, we cannot reject the possibility that HD109833 is a young field star coincidentally nearby the population. Description: We obtain three spectra of HD109833 using the Network of Robotic Echelle Spectrographs (NRES) at the Las Cumbres Observatory (LCO). Observations were taken the nights of 2022 April 3, 4, and 5. NRES spectra cover 380-860nm at high resolution (R∼53000). We also obtain seven spectra of that star taken with the High Accuracy Radial velocity Planet Searcher (HARPS) fiber-fed Echelle Spectrograph on the ESO 3.6m telescope at La Silla Observatory under the NCORES large program (ID 1102.C-0249, PI: Armstrong). The spectra are high resolution (R∼115000), and cover a spectral range of 378-691nm. Observations were taken on the nights of 2020 January 10-11 and 13-17 in high-accuracy mode, with an exposure time of 1500-1800s. We acquire 12 spectra of HD109833 using CHIRON at the SMARTS 1.5m telescope at Cerro Tololo Inter-American Observatory. These observations were acquired between 2021 January 26 and 2022 June 12. We use CHIRON in its image slicer mode, which gives a resolution of ∼79000 across 415-880nm. Objects: ------------------------------------------------------------ RA (ICRS) DE Designation(s) (Period) ------------------------------------------------------------ 12 39 06.40 -74 34 26.3 HD 109833 = TOI-1097 (P=5.111d) ------------------------------------------------------------ File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 40 21 Radial velocity measurements of HD 109833 table5.dat 125 306 Members of MELANGE-4 -------------------------------------------------------------------------------- See also: I/259 : The Tycho-2 Catalogue (Hog+ 2000) I/337 : Gaia DR1 (Gaia Collaboration, 2016) VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006) J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999) J/A+A/381/446 : Astrometric Radial Velocities. III. (Madsen+, 2002) J/AJ/124/1670 : Post-T Tauri Stars in Sco-Cen Association (Mamajek+, 2002) J/A+A/460/695 : Search Associations Containing Young stars (Torres+, 2006) J/A+A/508/833 : SACY III. Li abundances (da Silva+, 2009) J/AJ/142/19 : Speckle observations of KOI (Howell+, 2011) J/MNRAS/416/3108 : Membership of Sco OB2 moving group (Rizzuto+, 2011) J/A+A/545/A32 : Chemical abundances of 1111 FGK stars (Adibekyan+, 2012) J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012) J/ApJ/746/154 : Kinematic parallaxes for Sco-Cen members (Pecaut+, 2012) J/ApJ/762/88 : Young stellar kinematic group candidate member (Malo+, 2013) J/MNRAS/435/1325 : Membership of the ε Cha association (Murphy+, 2013) J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013) J/A+A/556/A150 : SWEETCat I Stellar parameters for host stars (Santos+, 2013) J/MNRAS/434/966 : Measurements of Li in T-Tauri stars (Sergison+, 2013) J/ApJ/791/54 : Nearby M Dwarfs parameters (Gaidos+, 2014) J/AJ/147/146 : Spectroscopy of Tuc-Hor candidate members (Kraus+, 2014) J/A+A/583/A94 : [X/Fe] scatter derived for spectral lines (Adibekyan+, 2015) J/MNRAS/454/593 : Young moving groups in solar neighbourhood (Bell+, 2015) J/MNRAS/461/794 : Scorpius-Centaurus K-Type Stars (Pecaut+, 2016) J/ApJ/838/150 : The Taurus-Auriga ecosystem. I. (Kraus+, 2017) J/AJ/153/257 : Comoving stars in Gaia DR1 (Oh+, 2017) J/AJ/154/224 : Transiting planets young clusters from K2 (Rizzuto+, 2017) J/AJ/154/69 : ACRONYM II. β Pictoris Moving Group (Shkolnik+, 2017) J/ApJ/856/23 : BANYAN. XI. The BANYAN Σ algorithm (Gagne+, 2018) J/ApJ/868/32 : A large moving group within LCC association (Goldman+, 2018) J/AJ/155/196 : Analysis of K2 LCs for USco & ρOph (Rebull+, 2018) J/AJ/156/102 : TESS Input Catalog & Candidate Target List (Stassun+, 2018) J/AJ/156/259 : Robo-AO detected close binaries in Gaia DR2 (Ziegler+, 2018) J/AJ/157/196 : Close companions around young stars (Kounkel+, 2019) J/ApJ/871/63 : How to constrain M dwarf. II. Nearby binaries (Mann+, 2019) J/A+A/622/L13 : Stellar stream in Gaia DR2 discovery (Meingast+, 2019) J/MNRAS/492/431 : Planetary-mass companion to a solar-type star (Bohn+, 2020) J/A+A/634/A136 : Chemical S2- abundances of 719 FGKstars (Costa Silva+, 2020) J/ApJ/903/96 : The µTau Association (MUTA) (Gagne+, 2020) J/A+A/643/A71 : Members for 20 open clusters (Gutierrez Albarran+, 2020) J/AJ/159/19 : SOAR TESS survey. I. (Ziegler+, 2020) J/A+A/648/A73 : Discovery of directly imaged planet YSES 2b (Bohn+, 2021) J/AJ/161/24 : TRICERATOPS predictions for 384 TOIs (Giacalone+, 2021) J/ApJS/254/39 : Exoplanet candidates from TESS 1st 2yr obs (Guerrero+, 2021) J/ApJ/917/23 : SPYGLASS. I. Mapping young stellar structures (Kerr+, 2021) J/AJ/162/110 : GaiaEDR3 census of Taurus-Auriga comp (Krolikowski+, 2021) J/ApJ/921/167 : Rotators Praesepe with K2 LCs & Gaia EDR3 (Rampalli+, 2021) J/A+A/649/A3 : Gaia EDR3 photometric passbands (Riello+, 2021) J/AJ/161/171 : THYME. V. Discovering a stellar assoc. (Tofflemire+, 2021) J/AJ/163/275 : Theia 456; stellar stream in Milky Way disk (Andrews+, 2022) J/AJ/164/88 : THYME. VIII. MELANGE-3 candidate members (Barber+, 2022) J/AJ/164/215 : Candidate members of Cep-Her, RSG-5 and CH-2 (Bouma+, 2022) J/ApJ/924/84 : λ Orionis PMS stars with Gaia & SPOTS (Cao+, 2022) J/A+A/664/A105 : Stellar content of the ROSAT all-sky survey (Freund+, 2022) J/AJ/163/156 : THYME. VI. TOI-1227 radial velocity (Mann+, 2022) J/A+A/657/L3 : Rotation periods Group X candidate members (Messina+, 2022) J/AJ/164/115 : TESS Hunt Young & Maturing Exoplanets. VII. (Newton+, 2022) J/AJ/163/68 : Fiducial stellar spectrum of HD 63433 (Zhang+, 2022) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 14 A14 --- Inst Telescope used 16- 27 F12.4 d BJD [2458858/2459743] Barycentric Julian Date 29- 34 F6.3 km/s RVel [10.5/11] Radial velocity 36- 40 F5.3 km/s e_RVel [0.002/0.3] Error on RVel -------------------------------------------------------------------------------- Byte-by-byte Description of file: table5.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 19 A19 --- Gaia Gaia identifier 21- 29 F9.5 deg RAdeg [121/264] Right Ascension (J2016) 31- 38 F8.4 deg DEdeg [-88/-49] Declination (J2016) 40- 44 F5.2 mas plx [8.3/19.8] Gaia DR3 parallax 46- 51 F6.3 --- RUWE [0.72/63.7] Gaia RUWE value 53- 58 F6.3 mag Gmag [4.48/19] Gaia DR3 G-band magnitude 60- 65 F6.3 mag BP-RP [-0.13/4.83] Gaia DR3 (Blue-Red) passband color 67- 72 F6.3 mag Ksmag [4.64/13.86]? 2MASS Ks band magnitude 74- 79 F6.3 km/s RVel [-9.04/26.1]? Gaia DR3 radial velocity 81- 86 F6.3 km/s e_RVel [0.1/39]? Uncertainty in RVel 88- 93 F6.4 --- Prob [0.5/1] BANYAN derived probability 95- 99 F5.2 d PRot [0.1/20.6]? Rotational period from TESS data 101-102 I2 --- q_PRot [-2/3]? Quality value on PRot 104-113 I10 --- TIC ? TESS Input Catalog identifier 115-119 I5 --- HIP ? Hipparcos identifier 121-125 A5 --- FF Identified in original search for "friend" stars ? (1) -------------------------------------------------------------------------------- Note (1): Friends are less than 30pc away and a tangential velocity within 3km of HD109833. -------------------------------------------------------------------------------- History: From electronic version of the journal References: Newton et al. Paper I. 2019ApJ...880L..17N 2019ApJ...880L..17N Rizzuto et al. Paper II. 2020AJ....160...33R 2020AJ....160...33R Mann et al. Paper III. 2020AJ....160..179M 2020AJ....160..179M Newton et al. Paper IV. 2021AJ....161...65N 2021AJ....161...65N Cat. J/AJ/161/65 Tofflemire et al. Paper V. 2021AJ....161..171T 2021AJ....161..171T Cat. J/AJ/161/171 Mann et al. Paper VI. 2022AJ....163..156M 2022AJ....163..156M Cat. J/AJ/163/156 Newton et al. Paper VII. 2022AJ....164..115N 2022AJ....164..115N Cat. J/AJ/164/115 Barber et al. Paper VIII. 2022AJ....164...88B 2022AJ....164...88B Cat. J/AJ/164/88 Wood et al. Paper IX. 2023AJ....165...85W 2023AJ....165...85W This catalog Thao et al. Paper X. 2024AJ....168...41T 2024AJ....168...41T Cat. J/AJ/168/41 Capistrant et al. Paper XI. 2024AJ....167...54C 2024AJ....167...54C
(End) Prepared by [AAS], Coralie Fix [CDS], 14-Nov-2023
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