J/AJ/160/111 RI light curve of KELT-25 and KELT-26 (Martinez+, 2020)
KELT-25 b and KELT-26 b: a hot Jupiter and a substellar companion transiting
young A stars observed by TESS.
Martinez R.R., Gaudi B.S., Rodriguez J.E., Zhou G., Labadie-Bartz J.,
Quinn S.N., Penev K., Tan T.-G., Latham D.W., Paredes L.A., Kielkopf J.F.,
Addison B., Wright D.J., Teske J., Howell S.B., Ciardi D., Ziegler C.,
Stassun K.G., Johnson M.C., Eastman J.D., Siverd R.J., Beatty T.G.,
Bouma L., Bedding T., Pepper J., Winn J., Lund M.B., Villanueva S.,
Stevens D.J., Jensen E.L.N., Kilby C., Crane J.D., Tokovinin A.,
Everett M.E., Tinney C.G., Fausnaugh M., Cohen D.H., Bayliss D., Bieryla A.,
Cargile P.A., Collins K.A., Conti D.M., Colon K.D., Curtis I.A., Depoy D.L.,
Evans P., Feliz D.L., Gregorio J., Rothenberg J., James D.J., Joner M.D.,
Kuhn R.B., Manner M., Khakpash S., Marshall J.L., McLeod K.K., Penny M.T.,
Reed P.A., Relles H.M., Stephens D.C., Stockdale C., Trueblood M.,
Trueblood P., Yao X., Zambelli R., Vanderspek R., Seager S., Jenkins J.M.,
Henry T.J., James H.-S., Jao W.-C., Wang S.X., Butler P., Thompson I.,
Shectman S., Wittenmyer R., Bowler B.P., Horner J., Kane S.R., Mengel M.W.,
Morton T.D., Okumura J., Plavchan P., Zhang H., Scott N.J., Matson R.A.,
Mann A.W., Dragomir D., Gunther M., Ting E.B., Glidden A., Quintana E.V.
<Astron. J., 160, 111 (2020)>
=2020AJ....160..111M 2020AJ....160..111M
ADC_Keywords: Exoplanets; Stars, A-type; Stars, early-type; Photometry, RI
Keywords: Exoplanet astronomy ; Transit photometry ; Radial velocity
Abstract:
We present the discoveries of KELT-25b (TIC 65412605, TOI-626.01) and
KELT-26b (TIC 160708862, TOI-1337.01), two transiting companions
orbiting relatively bright, early A stars. The transit signals were
initially detected by the KELT survey and subsequently confirmed by
Transiting Exoplanet Survey Satellite (TESS) photometry. KELT-25b is
on a 4.40day orbit around the V=9.66 star CD-245016
(Teff=8280-180+440K, M*=2.18-0.11+0.12M☉), while
KELT-26b is on a 3.34day orbit around the V=9.95 star HD134004
(Teff=8640-240+500K, M*=1.93-0.16+0.14M☉), which is
likely an Am star. We have confirmed the substellar nature of both
companions through detailed characterization of each system using
ground-based and TESS photometry, radial velocity measurements,
Doppler tomography, and high-resolution imaging. For KELT-25, we
determine a companion radius of RP=1.64-0.043+0.039RJ and a
3σ upper limit on the companion's mass of ∼64MJ. For KELT-26b,
we infer a planetary mass and radius of MP=1.41-0.51+0.43MJ and
RP=1.94-0.058+0.060RJ. From Doppler tomographic observations, we
find KELT-26b to reside in a highly misaligned orbit. This conclusion
is weakly corroborated by a subtle asymmetry in the transit light
curve from the TESS data. KELT-25b appears to be in a well-aligned,
prograde orbit, and the system is likely a member of the cluster
Theia449.
Description:
We obtained photometric observations of KELT-25 b and KELT-26 b from
the Kilodegree Extremely Little Telescope (KELT) Follow-Up Network.
Details about instruments and observations are available in Table2.
Objects:
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RA (2000) DE Designation(s) (Period)
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07 12 29.55 -24 57 12.8 KELT-25 = KELT-25 (P=4.401131)
15 09 04.89 -42 42 17.8 KELT-26 = KELT-26 (P=3.3448412)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 76 5 Follow-up photometric observations of KELT-25 b
and KELT-26 b
fig4.dat 62 615 KELT-FUN light curve followup of KELT-25 in Rc band
fig5i.dat 38 280 KELT-FUN light curve followup of KELT-26 in I band
fig5r.dat 84 166 KELT-FUN light curve followup of KELT-26 in r' band
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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)
I/340 : UCAC5 Catalogue (Zacharias+ 2017)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
J/A+A/410/527 : Abundances in the Galactic disk (Bensby+, 2003)
J/ApJ/640/1051 : 25pc sample of Sun-like stars (Grether+, 2006)
J/A+A/463/671 : Rotational velocities of A-type stars. III. (Royer+,2007)
J/ApJ/720/1118 : i-band photometry of HAT-P-16 (Buchhave+, 2010)
J/A+A/516/A95 : Photometry and spectroscopy of HD 80606b (Hebrard+, 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/756/L33 : RVs of 2 hot Jupiters in Praesepe (Quinn+, 2012)
J/ApJ/761/123 : KELT-1 photometry and spectro. follow-up (Siverd+, 2012)
J/A+A/537/A120 : Rotational velocities of A-type stars. IV. (Zorec+, 2012)
J/AJ/150/12 : Radial velocity of HD 33643 (Bieryla+, 2015)
J/AJ/150/197 : Photometry and spectroscopy of HAT-P-57 (Hartman+, 2015)
J/AJ/152/136 : Follow-up photometry & spectroscopy KELT-17 (Zhou+, 2016)
J/A+A/606/A73 : MASCARA-1 b light curves and spectra (Talens+, 2017)
J/ApJS/239/2 : Simulated exoplanets from TESS list (Barclay+, 2018)
J/AJ/156/234 : KELT transit false positive cat. for TESS (Collins+,2018)
J/AJ/155/120 : RV variability of K-giant γDraconis (Hatzes+, 2018)
J/A+A/612/A57 : MASCARA-2 b light curves and spectra (Talens+, 2018)
J/AJ/158/45 : TESS light curve & RVs for HD1397 (Brahm+, 2019)
J/A+A/627/A165 : KELT-9 b atmos. model transm. spectra (Hoeijmakers+,2019)
J/AJ/158/113 : Kepler-13AB aperture photometry (Howell+, 2019)
J/AJ/158/122 : Local structure & star formation of MW (Kounkel+, 2019)
J/AJ/157/211 : Unresolved binaries TESS speckle imaging (Matson+, 2019)
J/AJ/158/197 : Radial velocities & LCs of KELT-24 (Rodriguez+, 2019)
J/AJ/157/191 : LC & radial velocities for TOI-172 (Rodriguez+, 2019)
J/AJ/157/31 : Differential photometry & RVs of HATS-70 (Zhou+, 2019)
J/AJ/158/141 : Diff photom. & RVs of HAT-P-69 & HAT-P-70 (Zhou+, 2019)
J/AJ/159/19 : SOAR TESS survey. I. (Ziegler+, 2020)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Target Target identification
11- 24 A14 --- ObsID Observatory (1)
26- 29 I4 yr Obs.Y [2016/2019] UT year of observation
31- 33 A3 "month" Obs.M UT month of observation
35- 36 I2 d Obs.D UT day of observation
38- 43 F6.4 m Diam [0.1/0.69] Diameter
45- 54 A10 --- Filt Filter used
56- 66 A11 --- FOV Field of view
68- 71 F4.1 arcsec Scale [0.4/21] Pixel scale
73- 76 I4 s Texp [30/1800] Exposure time
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Note (1): Observatory as follows :
PEST = The Perth Exoplanet Survey Telescope, Perth, Australia (owned
by Thiam-Guan Tan).
TESS = Transiting Exoplanet Survey Satellite, camera 2 in sector 7.
Mt.Kent CDK700 = University of Louisville's Shared Skies MKO-CDK700
telescope at Mt. Kent Observatory, University of
Southern Queensland, Australia.
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Byte-by-byte Description of file: fig4.dat
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Bytes Format Units Label Explanations
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1- 24 F24.16 d BJD [2458502/2458503] Barycentric Julian Date
26- 43 F18.16 --- Flux [0.987/1.02] Flux, relative from Rc band photometry
45- 62 F18.16 --- e_Flux [0.001/0.003] Uncertainty in Flux
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Byte-by-byte Description of file: fig5i.dat
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Bytes Format Units Label Explanations
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1- 16 F16.8 d BJD [2457595/2457597] Barycentric Julian Date
18- 27 F10.8 --- Flux [0.974/1.01] Flux, relative from I band photometry
29- 38 F10.8 --- e_Flux [0.001/0.003] Uncertainty in Flux
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Byte-by-byte Description of file: fig5r.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d BJD [2458198/2458199] Barycentric Julian Date, TBD
16- 23 F8.6 --- FluxT1 [0.982/1.01] Normalized Flux
25- 32 F8.6 --- e_FluxT1 [0.0005/0.0006] Uncertainty in Flux
34- 41 F8.6 --- FluxT7 [0.952/0.962] Normalized Flux in Nearby Star
43- 50 F8.6 --- e_FluxT7 [0.0001/0.0002] Uncertainty Flux in Nearby Star
52- 66 F15.6 ct Counts [10510984/14442405] Total counts
68- 75 F8.6 --- Airmass [1.03/1.83] Airmass
77- 84 F8.6 d JD-UTC [0.02/0.23] Correction to UTC
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 22-Oct-2020