J/AJ/166/136 HIRES/HARPS radial velocities for HAT-P-2 (de Beurs+, 2023)
Revisiting Orbital Evolution in HAT-P-2 b and Confirmation of HAT-P-2 c.
de Beurs Z.L., de Wit J., Venner A., Berardo D., Bryan J., Winn J.N.,
Fulton B.J., Howard A.W.
<Astron. J., 166, 136 (2023)>
=2023AJ....166..136D 2023AJ....166..136D
ADC_Keywords: Exoplanets; Spectra, optical; Radial velocities
Keywords: Star-planet interactions ; Orbital evolution ; Astrometry ;
Radial velocity ; Exoplanets ; Hot Jupiters
Abstract:
One possible formation mechanism for Hot Jupiters is that
high-eccentricity gas giants experience tidal interactions with their
host star that cause them to lose orbital energy and migrate inwards.
We study these types of tidal interactions in an eccentric Hot Jupiter
called HAT-P-2b, which is a system where a long-period companion has
been suggested and hints of orbital evolution were detected. Using 5
additional years of radial velocity (RV) measurements, we further
investigate these phenomena. We investigated the long-period companion
by jointly fitting RVs and Hipparcos-Gaia astrometry and confirmed
this long-period companion, significantly narrowed down the range of
possible periods (P2=8500-1500+2600days), and determined that it
must be a substellar object (10.7-2.2+5.2Mj). We also developed a
modular pipeline to simultaneously model rapid orbital evolution and
the long-period companion. We find that the rate and significance of
evolution are highly dependent on the long-period companion modeling
choices. In some cases the orbital rates of change reached
d/dt=3.28-1.72+1.75x10-3/yr,
dω/dt=1.12°±0.22deg/yr, which corresponds to a ∼321yr
apsidal precession period. In other cases, the data is consistent with
de/dt=7.67±18.6x10-4/yr, dω/dt=0.76°±0.24°/yr.
The most rapid changes found are significantly larger than the
expected relativistic precession rate and could be caused by transient
tidal planet-star interactions. To definitively determine the
magnitude and significance of potential orbital evolution in HAT-P-2b,
we recommend further monitoring with RVs and precise transit and
eclipse timings.
Description:
Our analysis includes 72 spectra of HAT-P-2 obtained by the CPS Team
using HIRES on the W.M. Keck Observatory 10m telescope, Keck I. In
addition to our 72 HIRES radial velocities, we also included 31
publicly available RVs from the HARPS-N spectrograph at the 3.6m
Telescopio Nazionale Galileo on La Palma in the Canary Islands.
HARPS-N is a temperature and pressure-stabilized echelle spectrograph.
HARPS-N spans the wavelength range from 383 to 693nm and has a
resolving power of 115000.
Objects:
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RA (2000) DE Designation(s) (Period)
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16 20 36.35 +41 02 53.1 HAT-P-2b = HD 147506b (P=8500d)
16 20 36.35 +41 02 53.1 HAT-P-2c = HD 147506c
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 48 103 Summary of radial velocity measurements
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See also:
J/ApJ/692/L9 : Tidal evolution of trans extrasolar planets (Levrard+, 2009)
J/ApJ/757/18 : Radial velocities 16 hot Jupiter host stars (Albrecht+, 2012)
J/ApJ/785/126 : HIRES radial velocity measurements (Knutson+, 2014)
J/A+A/602/A107 : 231 transiting planets eccentricity and mass (Bonomo+, 2017)
J/AJ/156/213 : Properties N2K stars & new gas giant companions (Ment+, 2018)
J/AJ/158/181 : Radial velocities & S-index values for HR 5183 (Blunt+, 2019)
J/ApJS/254/42 : Hipparcos-Gaia (EDR3) Catalog of Accelerations (Brandt, 2021)
J/AJ/163/273 : Radial velocity of HD 83443 (Errico+, 2022)
J/ApJS/259/62 : TESS transit timing of hot Jupiters (Ivshina+, 2022)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 F10.5 d BJD [3981/9093] Barycentric Julian Date; BJD-2450000
12- 19 F8.2 m/s RVel [-1128/827] Radial velocity
21- 25 F5.2 m/s e_RVel [1/13] Uncertainty in RVel
27- 48 A22 --- Inst Instrument used; HARPS or HIRES
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 05-Apr-2024