J/AJ/165/268 Radial velocity and rotation period of HIP 33069b (Vowell+, 2023)
HIP 33609 b; An Eccentric Brown Dwarf Transiting a V=7.3 Rapidly Rotating B Star
Vowell N., Rodriguez J.E., Quinn S.N., Zhou G., Vanderburg A., Mann A.W.,
Hooton M.J., Stassun K.G., Howard S., Bieryla A., Latham D.W.,
Howell S.B., Guillot T., Ziegler C., Collins K.A., Carmichael T.W.,
Jenkins J.M., Shporer A., ABE L., Bendjoya P., Bush J.L., Buttu M.,
Collins K.I., Eastman J.D., Fields M.J., Gasparetto T., Gunther M.N.,
Kostov V.B., Kraus A.L., Lester K.V., Levine A.M., Littlefield C.,
Marie-Sainte W., Mekarnia D., Osborn H.P., Rapetti D., Ricker G.R.,
Seager S., Sefako R., Srdoc G., Suarez O., Torres G., Triaud A.H.M.J.,
Vanderspek R., Winn J.N.
<Astron. J., 165, 268 (2023)>
=2023AJ....165..268V 2023AJ....165..268V
ADC_Keywords: Stars, B-type; Stars, brown dwarf; Spectra, optical;
Photometry, infrared; Radial velocities
Keywords: Exoplanets ; Brown dwarfs ; Young star clusters ; Direct
imaging ; CCD photometry ; High resolution spectroscopy ;
Exoplanet evolution
Abstract:
We present the discovery and characterization of HIP33609b, a
transiting warm brown dwarf orbiting a late B-star, discovered by
NASA's Transiting Exoplanet Survey Satellite as TOI-588b. HIP33609b is
a large (Rb=1.580-0.070+0.074RJup) brown dwarf on a highly
eccentric (e=0.560-0.031+0.029) orbit with a 39days period. The
host star is a bright (V=7.3mag), Teff=10400-660+800K star with a
mass of M*=2.383-0.095+0.10M☉ and radius of
R*=1.863-0.082+0.087R☉, making it the hottest transiting brown
dwarf host star discovered to date. We obtained radial velocity
measurements from the CHIRON spectrograph confirming the companion's
mass of Mb=68.0-7.1+7.4MJup as well as the host star's rotation
rate (vsini*=55.6±1.8km/s). We also present the discovery of a new
comoving group of stars, designated as MELANGE-6, and determine that
HIP33609 is a member. We use a combination of rotation periods and
isochrone models fit to the cluster members to estimate an age of
150±25Myr. With a measured mass, radius, and age, HIP33609b
becomes a benchmark for substellar evolutionary models.
Description:
We observed HIP33609 on 39 separate nights from 2020 January 24 UT
through 2021 November 2 UT using the CHIRON spectrograph on the 1.5m
SMARTS telescope located at the Cerro Tololo Inter-American
Observatory in Chile. CHIRON is a high-resolution echelle spectrograph
fed with an image slicer through a single multimode fiber, which
achieves a spectral resolving power of R=80000 over the range
410-870nm
TESS observes a 24x96deg patch of the sky for approximately 27days
before moving to a new sector. In order to rule out contamination by a
background eclipsing binary and refine the ephemeris, we observed
HIP33609 as a part of SubGroup 1 of TFOP. We obtained these
observations using the Las Cumbres Observatory Global Telescope
(LCOGT) telescope network and the 40cm ASTEP-400 telescope. We
observed an ingress of HIP33609b on 2020 December 8 UT from LCOGT-SSO
on the 1m telescope in the y band at 25s cadence with a pixel scale of
0.389". We observed an egress on 2020 August 12 UT and a full transit
on 2021 June 23 UT with ASTEP using a 25s exposure time with a pixel
scale of 0.93".
Objects:
-------------------------------------------------------
RA (2000) DE Designation(s) (Period)
-------------------------------------------------------
06 58 59.98 -47 01 24.0 HIP33609 = TOI-588 (P=39d)
-------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 28 39 Radial velocity measurements for HIP 33609 system
fig6.dat 70 283 Rotation periods of candidate members of MELANGE-6
as a function of BP-RP color
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See also:
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/ApJ/710/1724 : Follow-up photometry for HAT-P-11 (Bakos+, 2010)
J/AJ/142/19 : Speckle observations of KOI (Howell+, 2011)
J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)
J/ApJ/761/123 : KELT-1 photometry and spectroscopy follow-up (Siverd+, 2012)
J/A+A/553/A49 : WASP-19b secondary eclipses (Abe+, 2013)
J/ApJ/788/92 : Hot Jupiter Kepler-13Ab planet's occultation (Shporer+, 2014)
J/ApJ/822/86 : False positive proba for Q1-Q17 DR24 KOIs (Morton+, 2016)
J/AJ/152/113 : Pleiades members K2 light curves. I. Periods (Rebull+, 2016)
J/AJ/152/180 : Bolometric fluxes eclipsing binaries Tycho-2 (Stassun+, 2016)
J/AJ/152/136 : Follow-up photometry and spectroscopy of KELT-17 (Zhou+, 2016)
J/A+A/600/A30 : Limb-darkening for TESS satellite (Claret, 2017)
J/AJ/153/136 : Planets & their host with Gaia parallaxes (Stassun+, 2017)
J/A+A/606/A73 : MASCARA-1b (HD201585) light curves and spectra (Talens+, 2017)
J/MNRAS/477/3406 : HATS-39b, 40b, 41b and 42b transit data (Bento+, 2018)
J/AJ/156/102 : TESS Input Catalog and Candidate Target List (Stassun+, 2018)
J/AJ/158/122 : Localstructure & star formation history of MW (Kounkel+, 2019)
J/AJ/158/141 : Differential photometry & RVs HAT-P-69 &HAT-P-70 (Zhou+, 2019)
J/AJ/159/255 : Obs & radial velocity of WASP-150 & WASP-176 (Cooke+, 2020)
J/A+A/636/A98 : WASP-18A, WASP-19, WASP-77A photometry (Cortes-Zuleta+, 2020)
J/AJ/159/19 : SOAR TESS survey. I. (Ziegler+, 2020)
J/AJ/162/292 : Radial velocity & transit photometry TOI-1431 (Addison+, 2021)
J/AJ/161/97 : Radial Velocities of TOI-811 and TOI-852 (Carmichael+, 2021)
J/A+A/652/A127 : 13-150MJup eclipsing binaries transiting comp (Grieves+, 2021)
J/ApJS/254/39 : Exoplanet candidates from TESS first 2yr obs (Guerrero+, 2021)
J/AJ/162/75 : Speckle obs TESS exoplanet host stars. II. (Lester+, 2021)
J/AJ/162/176 : The solar neighborhood. XLVIII. (Paredes+, 2021)
J/ApJ/921/167 : Rotators in Praesepe with K2 LCs & Gaia EDR3 (Rampalli+, 2021)
J/AJ/161/171 : THYME. V. Discovering stellar association (Tofflemire+, 2021)
J/A+A/648/A71 : TESS optical phase curve of KELT-1b (von Essen+, 2021)
J/AJ/163/275 : Theia 456; a stellar stream in Milky Way disk (Andrews+, 2022)
J/AJ/164/88 : THYME. VIII. MELANGE-3 candidate members (Barber+, 2022)
J/A+A/658/A75 : MASCARA-1 b occultation & transit light curves (Hooton+, 2022)
J/AJ/163/156 : THYME. VI. TOI-1227 radial velocity (Mann+, 2022)
J/AJ/163/228 : Limb-darkening coefficients 176 TESS exoplanets (Patel+, 2022)
J/A+A/664/A94 : 8 TOI RV curves and 2 TOI light curves (Psaridi+, 2022)
J/AJ/164/70 : TESS Grand Unified HotJupiter Survey I 10 planets (Yee+, 2022)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 --- BJD [2458872/2459521e] Barycentric Julian Date at TBD
15- 21 F7.1 m/s RVel [26993/33897] Radial velocity
23- 28 F6.1 m/s e_RVel [591/1782] Error on RVel
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Byte-by-byte Description of file: fig6.dat
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Bytes Format Units Label Explanations
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1- 9 I9 --- TIC TESS Input Catalog identifier
11- 21 F11.7 deg RAdeg [91/118] Right Ascension (J2000)
23- 33 F11.7 deg DEdeg [-57/-38] Declination in decimal degrees (J2000)
35- 40 F6.3 mag Gmag [5.35/20.5] Gaia DR3 G band magnitude
42- 47 F6.3 mag BpRp [-0.13/4.02] Gaia DR3 (Bp-Rp) color
49- 53 F5.3 km/s Voff [0/5] Relative velocity offset
55- 66 F12.9 d Prot [0.19/24.2]? Rotational period
68- 70 I3 --- Q ? Quality flag from Rampalli+, 2021, J/ApJ/921/167
(1)
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Note (1): Flags as follows:
0 = A clear periodic modulation in the light curve and a strong,
sharp peak in the periodogram.
1 = Evidence of modulation in the light curve, but the structure in
the first half of the light curve makes it difficult to
confidently claim a period.
2 = Evidence for a long-term periodic trend likely due to systematics.
3 = Systematics completely dominate the light curve structure.
-1 = stars that have identical light curves, meaning they fall on the
same TESS pixel and so even if there is rotation we wouldn't
be able to distinguish which star it belongs to.
-2 = An eclipsing binary where, even though at least one of the stars
may be rotating, our period search kept picking up the period
of the binary.
-99 = no data or star is beyond TESS rotation period detection limits.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 27-Oct-2023