J/AJ/166/85ivo://CDS.VizieR/J/AJ/166/85doi:10.26093/cds/vizier.51660085CDSHoch K.K.W.Konopacky Q.M.Theissen C.A.Ruffio J.-B.Barman T.S.,Rickman E.L.Perrin M.D.Macintosh B.Marois C.2024-11-06T20:19:08Z2024-04-05T07:04:32ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frmultiple-starsinfrared-astronomyspectroscopyThe carbon-to-oxygen (C/O) ratio in an exoplanet atmosphere has been suggested as a potential diagnostic of planet formation. Now that a number of exoplanets have measured C/O ratios, it is possible to examine this diagnostic at a population level. Here, we present an analysis of currently measured C/O ratios of directly imaged and transit/eclipse planets. First, we derive atmospheric parameters for the substellar companion HD 284149 AB b using data taken with the OSIRIS integral field spectrograph at the W.M. Keck Observatory and report two non-detections from our ongoing imaging spectroscopy survey with Keck/OSIRIS. We find an effective temperature of Teff=2502K, with a range of 2291-2624K, logg=4.52, with a range of 4.38-4.91, and [M/H]=0.37, with a range of 0.10-0.55. We derive a C/O of 0.59_-0.30_^+0.15^ for HD284149ABb. We add this measurement to the list of C/O ratios for directly imaged planets and compare them with those from a sample of transit/eclipse planets. We also derive the first dynamical mass estimate for HD284149ABb, finding a mass of ~28MJup. There is a trend in C/O ratio with companion mass (MJup), with a break seen around 4MJup. We run a Kolmogorov-Smirnov and an Anderson-Darling test on planets above and below this mass boundary, and find that they are two distinct populations. This could be additional evidence of two distinct populations possibly having two different formation pathways, with companion mass as an indicator of most likely formation scenario.2023AJ....166...85Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/166/85CatalogResearchIsServedByTAP VizieR generic servicerelated-toIV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)I/350 : Gaia EDR3 (Gaia Collaboration, 2020)J/A+A/482/L17 : CoRoT space mission. I. 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(West+, 2016)J/A+A/587/A57 : HR 8799e and HR 8799d spectra (Zurlo+, 2016)J/A+A/608/A106 : HD 284149 SPHERE/IFS spectrum (Bonavita+, 2017)J/A+A/602/A107 : 231 transiting planets eccentricity and mass (Bonomo+, 2017)J/A+A/605/L9 : NIR spectrum of exoplanet HIP 65426b (Chauvin+, 2017)J/ApJ/838/150 : The Taurus-Auriga ecosystem. I. (Kraus+, 2017)J/AJ/153/46 : Spectroscopy of candidate members in Taurus (Luhman+, 2017)J/A+A/603/A30 : Evidence for 2 distinct giant planet pop (Santos+, 2017)J/AJ/153/136 : Planets & host stars with Gaia parallaxes (Stassun+, 2017)J/AJ/157/217 : Transit times of 5 hot Jupiter WASPexoplanets (Bouma+, 2019)J/MNRAS/485/5168 : Light curves of WASP-74 (Mancini+, 2019)J/AJ/158/13 : The first 300 stars observed by the GPIES (Nielsen+, 2019)J/AJ/157/82 : TEMP. V. Photo of HAT-P-9, HAT-P-32 & HAT-P-36 (Wang+, 2019)J/AJ/158/141 : Differential photo & RVs of HAT-P69 & HAT-P-70 (Zhou+, 2019)J/MNRAS/492/431 : Planetary-mass companion to a solar-type star (Bohn+, 2020)J/A+A/635/A205 : Ultra-hot Jupiter WASP-121b transits (Bourrier+, 2020)J/A+A/636/A98 : WASP-18A, WASP-19, WASP-77A photo (Cortes-Zuleta+, 2020)J/A+A/633/A110 : K band spectrum of beta Pictoris b (GRAVITY+, 2020)J/AJ/160/207 : OSIRIS K-band spectroscopy of kAndromedae b (Wilcomb+, 2020)J/ApJS/254/42 : Hipparcos-Gaia (EDR3) Cat of Accelerations (Brandt, 2021)J/ApJS/257/45 : BDKP. V. Radial & rot. veloc of M, L, T dwarfs (Hsu+, 2021)J/AJ/162/290 : OSIRIS Kband spectra planets HR8799b, c, & d (Ruffio+, 2021)J/ApJS/260/3 : 25 hot-Jupiter properties HST & Spitzer (Changeat+, 2022)J/AJ/164/155 : Kband spectroscopy of substellar comp VHS1256b (Hoch+, 2022)J/ApJ/926/141 : 3-D kinematics of Orion Nebula Cluster (Theissen+, 2022)J/A+A/673/A98 : 51 Eri b SPHERE/IFS YH spectrum (Brown-Sevilla+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/166/85https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/166/85http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/166/85https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/166/85https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/166/85http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/166/85GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/AJ/166/85/fig2OSIRIS K-band spectra of HD 284149 AB brecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWave[1.96/2.39] Wavelengthumem.wlfloatFlux[0.53/1.18] Flux densityW.m**-2.um**-1phot.flux.density;em.IR.Kfloate_Flux[0.001/0.2] Uncertainty in FluxW.m**-2.um**-1stat.error;phot.fluxfloat