J/A+A/670/A162 Contrast curve of Vega in 2018 (Ren+, 2023)
Planet Search with the Keck/NIRC2 Vortex Coronagraph in Ms band for Vega.
Ren B.B., Wallack N.L., Hurt S.A., Mawet D., Carter A.L., Echeverri D.,
Llop-Sayson J., Meshkat T., Oppenheimer R., Aguilar J., Cady E., Choquet E.,
Ruane G., Vasisht G., Ygouf M.
<Astron. Astrophys. 670, A162 (2023)>
=2023A&A...670A.162R 2023A&A...670A.162R (SIMBAD/NED BibCode)
ADC_Keywords: Stars, nearby ; Photometry, infrared
Keywords: planets and satellites: detection -
techniques: high angular resolution - techniques: image processing -
planets and satellites: individual: Vega - stars: imaging
Abstract:
Gaps in circumstellar disks can signal the existence of planetary
perturbers, making such systems preferred targets for direct imaging
observations of exoplanets.
Being one of the brightest and closest stars to the Sun, the
photometric standard star Vega hosts a two-belt debris disk structure.
Together with the fact that its planetary system is being viewed
nearly face-on, Vega has been one of the prime targets for planet
imaging efforts.
Using the vector vortex coronagraph on Keck/NIRC2 in Ms-band at
4.67-micron, we report the planet detection limits from 1 au to 22au
for Vega with an on-target time of 1.8h.
We reach a 3 Jupiter mass limit exterior to 12au, which is nearly an
order of magnitude deeper than existing studies. Combining with
existing radial velocity studies, we can confidently rule out the
existence of companions more than ∼8 Jupiter mass from 22au down to
0.1au for Vega. Interior and exterior to ∼4au, this combined
approach reaches planet detection limits down to ∼2-3 Jupiter mass
using radial velocity and direct imaging, respectively.
By reaching multi-Jupiter mass detection limits, our results are
expected to be complemented by the planet imaging of Vega in the
upcoming observations using the James Webb Space Telescope to obtain a
more holistic understanding of the planetary system configuration
around Vega.
Description:
Keck/NIRC2 Ms-band 5-sigma detection limits of companions surrounding
Vega.
Objects:
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RA (2000) DE Designation(s)
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18 36 56.33 +38 47 01.28 Vega = * alf Lyr
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
contrast.dat 26 269 5-sigma contrast curve of Vega
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See also:
J/AJ/135/2245 : Absolute spectrum of Sun & Vega for 0.2-30um (Rieke+, 2008)
J/PASP/121/1065 : High-resolution spectrum of Vega: 3850-6860Å (Kim+, 2009)
J/A+A/531/L2 : Images of Vega at 1.3mm (Pietu+, 2011)
J/AJ/146/68 : Spectra of Vega, Sirius, GD153 and HD209458 (Linnell+, 2013)
Byte-by-byte Description of file: contrast.dat
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Bytes Format Units Label Explanations
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1- 8 E8.2 au Sep Radial separation from the star
10- 17 E8.2 --- Contrast Companion-to-star contrast
19- 26 E8.2 Mjup Mass Companion mass in units of Jupiter mass
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Acknowledgements:
Bin Ren, bin.ren(at)oca.eu
(End) Bin Ren [OCA/IPAG/Caltech], Patricia Vannier [CDS] 20-Jan-2023