J/AJ/165/264 130 Stellar and planetary parameters (Bennett+, 2023)
Nondetection of Helium in the Hot Jupiter WASP-48b.
Bennett K.A., Redfield S., Oklopcic A., Carleo I., Ninan J.P., Endl M.
<Astron. J., 165, 264 (2023)>
=2023AJ....165..264B 2023AJ....165..264B
ADC_Keywords: Exoplanets; Stars, F-type; Spectra, infrared; Spectral types;
Stars, ages; Stars, diameters; Stars, masses; Stars, distances
Keywords: Exoplanet astronomy ; Exoplanet atmospheres ; Hot Jupiters ;
High resolution spectroscopy ; Transmission spectroscopy
Abstract:
Hot Jupiters orbiting extremely close to their host star may
experience atmospheri; c escape due to the large amounts of high-energy
radiation they receive. Understanding the conditions under which this
occurs is critical, as atmospheric escape is believed to be a driving
factor in sculpting planetary populations. In recent years, the
near-infrared 10833Å helium feature has been found to be a
promising spectral signature of atmospheric escape. We use
transmission spectroscopy to search for excess helium absorption in
the extended atmosphere of WASP-48b, a hot Jupiter orbiting a slightly
evolved, rapidly rotating F star. The data were collected using the
Habitable-zone Planet Finder spectrograph on the Hobby-Eberly
Telescope. Observations were taken over the course of seven nights,
from which we obtain three transits. No detectable helium absorption
is seen, as absorption depth is measured to -0.0025±0.0021, or
1.2σ from a null detection. This nondetection follows our
current understanding of decreasing stellar activity (and thus
high-energy radiation) with age. We use a 1D isothermal Parker wind
model to compare with our observations and find that our nondetection
can best be explained with a low planetary mass-loss rate and high
thermosphere temperature. We explore our results within the context of
the full sample of helium detections and nondetections to date.
Surprisingly, comparing helium absorption with the stellar activity
index logR'HK reveals a large spread in the correlation between
these two factors, suggesting that there are additional parameters
influencing the helium absorption strength.
Description:
Observations were taken using the Habitable-zone Planet Finder (HPF),
a fiber-fed near-IR echelle spectrograph on the 10m Hobby-Eberly
Telescope (HET). The HPF has a wavelength range coverage of
8079-12786Å and resolving power of R∼55000.
Objects:
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RA (2000) DE Designation(s) (Period)
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19 24 38.96 +55 28 23.3 WASP-48 = GSC 03925-00739 (P=2.14363592d)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 369 37 *Stellar and planetary parameters for exoplanets
with published helium results
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Note on table5.dat: Values taken from NASA Exoplanet Archive
http://exoplanetarchive.ipac.caltech.edu unless otherwise noted.
Error bars are taken from the literature or, if missing, estimated by
taking the average error from the remaining data.
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See also:
J/A+A/415/1153 : [Fe/H] for 98 extra-solar planet-host stars (Santos+, 2004)
J/ApJ/710/1724 : Follow-up photometry for HAT-P-11 (Bakos+, 2010)
J/ApJ/726/52 : HAT-P-18 and HAT-P-19 follow-up (Hartman+, 2011)
J/ApJ/742/59 : HAT-P-32 and HAT-P-33 follow-up (Hartman+, 2011)
J/ApJ/743/48 : Stars with Prot and X-ray luminosities (Wright+, 2011)
J/A+A/546/A27 : Radial velocity and photometry for GJ3470 (Bonfils+, 2012)
J/A+A/549/A10 : Transits of GJ 1214 (Harpsoe+, 2013)
J/A+A/549/A134 : 4 new WASP transiting closein giant planets (Hebrard+, 2013)
J/A+A/551/A80 : WASP-80 photometric and radial velocity data (Triaud+, 2013)
J/MNRAS/445/1114 : WASP-69b, WASP-70Ab and WASP-84b (Anderson+, 2014)
J/A+A/563/A21 : GJ 1214 Trappist and Spitzer light curves (Gillon+, 2014)
J/A+A/585/A126 : 3 irradiated & bloated hot Jupiters RV & phot. (West+, 2016)
J/A+A/602/A107 : 231 transiting planets eccentricity and mass (Bonomo+, 2017)
J/AJ/154/109 : California-Kepler Survey. III. Planet radii (Fulton+, 2017)
J/A+A/599/A3 : WASP 127, 136 and 138 RV and light curves (Lam+, 2017)
J/ApJ/836/77 : Library of high-S/N optical spectra FGKM stars (Yee+, 2017)
J/A+A/616/A108 : Cool stars chromospheric activity cat. (Boro Saikia+, 2018)
J/A+A/619/A1 : 55 Cnc radial velocities and photometry (Bourrier+, 2018)
J/AJ/157/97 : Radial velocity measurements K2-3 & GJ3470 (Kosiarek+, 2019)
J/MNRAS/484/3731 : GJ 9827 HARPS-N RV data (Rice+, 2019)
J/MNRAS/485/5790 : WASP-177, WASP-181, WASP-183 RV & phot. data (Turner+, 2019)
J/AJ/159/239 : Transmission Spectroscopy Metric of exoplanets (Guo+, 2020)
J/A+A/644/A67 : EUV estimates from CaII H&K activity (Sreejith+, 2020)
J/AJ/159/278 : He-filter obs. of WASP-69b & WASP-52b (Vissapragada+, 2020)
J/AJ/162/82 : IRD &HPF spectra of TRAPPIST-1b,e & f (Krishnamurthy+, 2021)
J/AJ/161/70 : RVel for WASP-107 with HIRES & CORALIE (Piaulet+, 2021)
J/A+A/664/A163 : TOI-1807 RV and flux curves (Nardiello+, 2022)
J/AJ/163/68 : Fiducial stellar spectrum of HD 63433 (Zhang+, 2022)
J/AJ/163/67 : 5-55000Å spectrum of TOI 560 (Zhang+, 2022)
http://exoplanetarchive.ipac.caltech.edu : NASA Exoplanets Archive
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Planet Planet identifier
13- 21 F9.5 pc Dist [9.75/455] Distance
23- 29 F7.5 pc E_Dist [0.008/7]? Upper uncertainty in Dist
31- 37 F7.5 pc e_Dist [0.008/6] Lower uncertainty in Dist
39- 40 A2 --- r_Dist Reference code for Dis (1)
42- 48 A7 --- SpType Spectral type
50- 51 A2 --- r_SpType Reference code for SpType (1)
53- 57 I5 K Teff [2566/10170] Effective temperature
59- 61 I3 K E_Teff [18/450] Upper uncertainty in Teff
63- 65 I3 K e_Teff [18/450] Lower uncertainty in Teff
67- 68 A2 --- r_Teff Reference code for Teff (1)
70- 75 F6.3 Gyr Age [0.023/12.4]? Stellar age
77- 81 F5.3 Gyr E_Age [0.004/5.9]? Upper uncertainty in Age
83- 88 F6.3 Gyr e_Age [0.004/10.0]? Lower uncertainty in Age
90- 91 A2 --- r_Age Reference code for Age (1)
93- 98 F6.4 Rsun Rad [0.1192/2.362] Stellar radius
100-105 F6.4 Rsun E_Rad [0.0013/0.098] Upper uncertainty in Rad
107-112 F6.4 Rsun e_Rad [0.0013/0.09] Lower uncertainty in Rad
114-115 A2 --- r_Rad Reference code for Radius (1)
117-122 F6.4 Msun Mass [0.0898/2.52] Stellar mass
124-129 F6.4 Msun E_Mass [0.0023/0.25] Upper uncertainty in Mass
131-136 F6.4 Msun e_Mass [0.0023/0.2] Lower uncertainty in Mass
138-139 A2 --- r_Mass Reference code for Mass (1)
141-146 F6.3 [Sun] [Fe/H] [-0.28/0.35]? Stellar metallicity
148-152 F5.3 [Sun] E_[Fe/H] [0.02/0.2]? Upper uncertainty in [Fe/H]
154-158 F5.3 [Sun] e_[Fe/H] [0.02/0.2]? Lower uncertainty in [Fe/H]
160-161 A2 --- r_[Fe/H] Reference code for [Fe/H] (1)
163-163 A1 --- l_vsini Limit flag on vsin(i)
164-169 F6.2 km/s vsini [0.21/111.4]? Stellar projected rotational
velocity
171-175 F5.3 km/s E_vsini [0.01/2.0]? Upper uncertainty in vsin(i)
177-181 F5.3 km/s e_vsini [0.01/2.0]? Lower uncertainty in vsin(i)
183-184 A2 --- r_vsini Reference code for vsin(i) (1)
186-191 F6.3 [-] logRHK [-5.5/-4.04]? Stellar log R'HK index
193-198 F6.4 [-] e_logRHK [0.001/0.2]? Uncertainty in logR'HK
200-201 A2 --- r_logRHK Reference code for logR'HK (1)
203-209 F7.5 Rjup Radp [0.0821/1.891] Planetary radius
211-218 F8.6 Rjup E_Radp [0.00116/0.66] Upper uncertainty in Radp
220-227 F8.6 Rjup e_Radp [0.00107/0.36] Lower uncertainty in Radp
229-230 A2 --- r_Radp Reference code for Radp (1)
232-239 F8.6 Mjup Massp [0.00218/2.88]? Planetary mass
241-248 F8.6 Mjup E_Massp [7e-05/0.84]? Upper uncertainty in Massp
250-257 F8.6 Mjup e_Massp [7e-05/0.84]? Lower uncertainty in Massp
259-260 A2 --- r_Massp Reference code for Massp (1)
262-268 F7.5 AU a [0.01154/0.1688] Planetary semi-major axis
270-276 F7.5 AU E_a [5e-05/0.0062]? Upper uncertainty in a
278-284 F7.5 AU e_a [5e-05/0.0101]? Lower uncertainty in a
286-287 A2 --- r_a Reference code for a
289-294 F6.1 K Teq [219.0/4050.0] Planetary equilibrium
temperature
296-300 F5.1 K E_Teq [4.2/180.0]? Upper uncertainty in Teq
302-306 F5.1 K e_Teq [4.2/180.0]? Lower uncertainty in Teq
308-309 A2 --- r_Teq Reference for Teq (1)
311-315 F5.3 [cm/s2] logg [2.33/3.35]? log planetary surface gravity
317-321 F5.3 [cm/s2] E_logg [0.005/2.8]? Upper uncertainty in logg
323-327 F5.3 [cm/s2] e_logg [0.005/2.8]? Lower uncertainty in logg
329-330 A2 --- r_logg Reference for logg (1)
332-336 F5.3 --- deltaRp [0.002/7.58] Change in transit depth at
helium feature
338-343 F6.3 --- e_deltaRp [0.05/25.52] Uncertainty in deltaRp
345-347 A3 --- r_deltaRp Reference code for deltaRp (1)
349-354 F6.2 --- Ratio [0.29/125.3]? Normalized atmospheric height of
helium signature
356-361 F6.3 --- e_Ratio [0.004/82.9]? Uncertainty in Ratio
363-365 A3 --- r_Ratio Reference code for Ratio (1)
367-369 A3 --- Detect? Detection? Yes/No
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* = Denotes photometric measurement, which dilutes deltaRp.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 13-Oct-2023