J/AJ/167/45 Abundances in HD 181327 with MIKE (Reggiani+, 2024)
Insight into the Formation of beta Pic b through the Composition of Its
Parent Protoplanetary Disk as Revealed by the beta Pic Moving Group Member
HD181327
Reggiani H., Galarza J.Y., Schlaufman K.C., Sing D.K., Healy B.F.,
McWilliam A., Lothringer J.D., Pueyo L.
<Astron. J., 167, 45 (2024)>
=2024AJ....167...45R 2024AJ....167...45R
ADC_Keywords: Exoplanets; Abundances; Spectra, optical; Stars, high-velocity
Keywords: Exoplanet astronomy ; Exoplanet atmospheres ; Exoplanet
atmospheric composition ; Exoplanet formation ; Exoplanet
migration ; Exoplanet systems ; Planet hosting stars ; Stellar
abundances
Abstract:
It has been suggested that βPicb has a supersolar metallicity and
subsolar C/O ratio. Assuming solar carbon and oxygen abundances for
the star βPic and therefore the planet's parent protoplanetary
disk, βPicb's C/O ratio suggests that it formed via core
accretion between its parent protoplanetary disk's H2O and CO2 ice
lines. However, βPicb's high metallicity is difficult to
reconcile with its mass Mp=11.7MJup. Massive stars can present
peculiar photospheric abundances that are unlikely to record the
abundances of their former protoplanetary disks. This issue can be
overcome for early-type stars in moving groups by inferring the
elemental abundances of the FGK-stars in the same moving group that
formed in the same molecular cloud and presumably share the same
composition. We infer the photospheric abundances of the F-dwarf
HD181327, a βPic moving group member that is the best available
proxy for the composition of βPicb's parent protoplanetary disk.
In parallel, we infer updated atmospheric abundances for βPicb.
As expected for a planet of its mass formed via core-accretion beyond
its parent protoplanetary disk's H2O ice line, we find that
βPicb's atmosphere is consistent with stellar metallicity and
confirm that it has superstellar carbon and oxygen abundances with a
substellar C/O ratio. We propose that the elemental abundances of FGK
dwarfs in moving groups can be used as proxies for the otherwise
difficult-to-infer elemental abundances of early-type and late-type
members of the same moving groups.
Description:
We collected spectrum with the Magellan Inamori Kyocera Echelle (MIKE)
spectrograph on the Magellan Clay Telescope at Las Campanas
Observatory. We used the 0.7" slit with standard blue and red grating
azimuths, yielding spectra between 335 and 950nm with resolution
R∼40000 in the blue and R∼31000 in the red arms.
Objects:
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RA (2000) DE Designation(s)
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19 22 58.94 -54 32 16.9 HD 181327 = 2MASS J19225894-5432170
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 39 183 Atomic data, equivalent widths, and line abundances
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See also:
B/simbad : Simbad objects catalogue (M.Wenger 2000)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/ApJ/743/156 : NEOWISE obs of NEOs; preliminary results (Mainzer+, 2011)
J/A+A/564/A125 : AGN Torus model comparison AGN in the CDFS (Buchner+, 2014)
J/AJ/151/144 : ASPCAP weights for 15 APOGEE elements (Garcia+, 2016)
J/MNRAS/474/5158 : Stars with hot Jupiter exoplanets (Goyal+, 2018)
J/A+A/630/A104 : Disk and halo stars C, O and Fe abundances (Amarsi+, 2019)
J/A+A/626/A80 : Census of RhoOph candidate membs Gaia DR2 (Canovas+, 2019)
J/A+A/630/A137 : Structure and kinematics of the Taurus region (Galli+, 2019)
J/A+A/627/A177 : Non-LTE analysis of K I in late-type stars (Reggiani+, 2019)
J/A+A/634/A98 : Corona-Australis DANCe. I. (Galli+, 2020)
J/A+A/633/A110 : K band spectrum of beta Pictoris b (GRAVITY+, 2020)
J/MNRAS/492/1164 : Abundances of Gaia DR2 wide binaries (Hawkins+, 2020)
J/ApJ/903/99 : Stellar spins in the open cluster NGC 2516 (Healy+, 2020)
J/A+A/642/A179 : beta Pictoris moving group RV 81 stars (Miret-Roig+, 2020)
J/ApJ/903/55 : APOGEE parameters through 83 open clusters (Poovelil+, 2020)
J/MNRAS/506/150 : The GALAH+ Survey DR3 (Buder+, 2021)
J/ApJ/923/23 : Stellar spins in the Pleiades, Praesepe & M35 (Healy+, 2021)
J/ApJ/921/118 : Abundances of Gaia EDR3 comoving pairs (Nelson+, 2021)
J/A+A/647/A49 : Chemical analysis of early-type stars planets (Saffe+, 2021)
J/A+A/645/A30 : SB updated census in SACY sample (Zuniga-Fernandez+, 2021)
J/ApJS/262/21 : 3-D selection of 167 sub-stellar companions (Feng+, 2022)
J/AJ/163/159 : Species abundances in WASP-77A (Reggiani+, 2022)
J/A+A/679/A116 : M-star spectra FeH, CrH, and NiH line lists (Crozet+, 2023)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 F8.3 10-10m Wave [3572/7837] Wavelength; angstroms
10- 13 A4 --- Species Species identifier
15- 19 F5.3 eV ExPot [0/9.15] Excitation potential
21- 26 F6.3 [-] loggf [-5.63/0.55] Log oscillator strength
28- 33 F6.2 10-13m EW [3.21/223] Equivalent width; milliangstroms
35- 39 F5.3 [-] logX [1.87/9.03] Log abundance
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 26-Apr-2024