J/AJ/166/85 K-band spectroscopy of HD 284149b (Hoch+, 2023)
Assessing the C/O Ratio Formation Diagnostic: A Potential Trend with Companion
Mass.
Hoch 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.
<Astron. J., 166, 85 (2023)>
=2023AJ....166...85H 2023AJ....166...85H
ADC_Keywords: Stars, double and multiple; Spectra, infrared
Keywords: Exoplanet atmospheres ; Direct imaging ; Exoplanet formation ;
Exoplanet atmospheric composition
Abstract:
The 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.
Description:
HD284149ABb was observed on 2017 November 3 with the OSIRIS
integral field spectrograph on the W.M. Keck I
telescope. We used the K-broadband mode (1.965-2.381um) with a
spatial sampling of 20mas per lenslet.
Objects:
----------------------------------------------------
RA (2000) DE Designation(s)
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04 06 38.80 +20 18 11.0 HD 284149ABb = HD 284149b
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fig2.dat 17 1665 OSIRIS K-band spectra of HD 284149 AB b
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See also:
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J/A+A/482/L17 : CoRoT space mission. I. (Barge+, 2008)
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J/AJ/144/139 : HAT-P-39, HAT-P-40, and HAT-P-41 follow-up (Hartman+, 2012)
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J/A+A/547/A61 : WASP78 and WASP79 RV and photometric data (Smalley+, 2012)
J/ApJ/777/160 : NIR imaging survey planets around MG stars (Biller+, 2013)
J/A+A/562/A127 : NIR integral field spectra of 15 ML dwarfs (Bonnefoy+, 2014)
J/A+A/562/L3 : WASP-103b radial velocities and light curves (Gillon+, 2014)
J/MNRAS/454/593 : Young moving groups in solar neighbourhood (Bell+, 2015)
J/AJ/150/12 : Radial velocity of HD 33643 (Bieryla+, 2015)
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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)
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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)
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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)
Byte-by-byte Description of file: fig2.dat
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Bytes Format Units Label Explanations
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1- 5 F5.3 um Wave [1.96/2.39] Wavelength
7- 11 F5.3 W/m2/um Flux [0.53/1.18] Flux density
13- 17 F5.3 W/m2/um e_Flux [0.001/0.2] Uncertainty in Flux
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 18-Mar-2024