J/AJ/165/207 TOI-778 TESS radial velocity & optical photometry (Clark+, 2023)
Spinning up a Daze; TESS Uncovers a Hot Jupiter Orbiting the Rapid Rotator
TOI-778.
Clark J.T., Addison B.C., Okumura J., Vach S., Errico A., Heitzmann A.,
Rodriguez J.E., Wright D.J., Clerte M., Brown C.J., Fetherolf T.,
Wittenmyer R.A., Plavchan P., Kane S.R., Horner J., Kielkopf J.F.,
Shporer A., Tinney C.G., Hui-Gen L., Ballard S., Bowler B.P., Mengel M.W.,
Zhou G., Lee A.S., David A., Heim J., Lee M.E., Sevilla V., Zafar N.E.,
Hinkel N.R., Allen B.E., Bayliss D., Berberyan A., Berlind P., Bieryla A.,
Bouchy F., Brahm R., Bryant E.M., Christiansen J.L., Ciardi D.R.,
Ciardi K.N., Collins K.A., Dallant J., Davis A.B., Diaz M.R.,
Dressing C.D., Esquerdo G.A., Harre J.-V., Howell S.B., Jenkins J.M.,
Jensen E.L.N., Jones M.I., Jordan A., Latham D.W., Lund M.B., McCormac J.,
Nielsen L.D., Otegi J., Quinn S.N., Radford D.J., Ricker G.R.,
Schwarz R.P., Seager S., Smith A.M.S., Stockdale C., Tan T.-G., Udry S.,
Vanderspek R., Gunther M.N., Wang S., Wingham G., Winn J.N.
<Astron. J., 165, 207 (2023)>
=2023AJ....165..207C 2023AJ....165..207C
ADC_Keywords: Exoplanets; Stars, F-type; Spectra, optical; Photometry;
Radial velocities
Keywords: Exoplanets ; Radial velocity ; Transit photometry ; Dynamical
evolution
Abstract:
NASA's Transiting Exoplanet Survey Satellite (TESS) mission has been
uncovering a growing number of exoplanets orbiting nearby, bright
stars. Most exoplanets that have been discovered by TESS orbit
narrow-line, slow-rotating stars, facilitating the confirmation and
mass determination of these worlds. We present the discovery of a hot
Jupiter orbiting a rapidly rotating (vsini=35.1±1.0km/s) early
F3V-dwarf, HD115447 (TOI-778). The transit signal taken from Sectors
10 and 37 of TESS's initial detection of the exoplanet is combined
with follow-up ground-based photometry and velocity measurements taken
from Minerva-Australis, TRES, CORALIE, and CHIRON to confirm and
characterize TOI-778b. A joint analysis of the light curves and the
radial velocity measurements yields a mass, a radius, and an orbital
period for TOI-778b of 2.76-0.23+0.24MJup, 1.370±0.043RJup,
and ∼4.63days, respectively. The planet orbits a bright (V=9.1mag)
F3-dwarf with M=1.40±0.05M☉, R=1.70±0.05R☉, and
logg=4.05±0.17. We observed a spectroscopic transit of TOI-778b,
which allowed us to derive a sky-projected spin-orbit angle of
18±11deg, consistent with an aligned planetary system. This
discovery demonstrates the capability of smaller-aperture telescopes
such as Minerva-Australis to detect the radial velocity signals
produced by planets orbiting broad-line, rapidly rotating stars.
Description:
TOI-778 was observed by Transiting Exoplanets Survey Satellite (TESS)
during Sector 10 of its primary mission, from 2019 March 26 to April
21, and extended via Sector 37 observations, taken between 2021 April
2 and April 28.
A transit egress of TOI-778b was observed using the Next-Generation
Transit Survey (NGTS) on UTC 2019 June 22. NGTS
is an exoplanet-hunting facility located at the ESO Paranal
Observatory in Chile, which consists of 12 independently operated
robotic telescopes. Each telescope has a 20cm diameter and an 8
square-degree field-of-view. (520-890nm)
We observed an egress of TOI-778 on UTC 2020 March 31 in V band from
the Perth Exoplanet Survey Telescope (PEST) near Perth, Australia. The
0.3m telescope is equipped with a 1530x1020 SBIG ST-8XME camera with
an image scale of 1.2"/pixel, resulting in a 31x21' field of view.
We observed a full transit of TOI-778 in the Pan-STARSS z-short band
on UTC 2020 May 30 from the Las Cumbres Observatory Global Telescope
network (LCOGT) 1.0m node at South Africa Astronomical Observatory.
The 4096x4096 LCOGT SINISTRO cameras have an image scale of 0.389" per
pixel, resulting in a 26x26' field of view.
On 2020 June 5 at the Mount Kent Observatory, a photometric transit
observation of TOI-778 was taken simultaneously with radial velocity
observations from Minerva-Australis. All data were taken using a Sloan
i' filter with a 27.3x27.3' field of view.
We observed TOI-778b on UTC 2020 April 28 in the Sloan r' band from
the Mt.Stuart Observatory near Dunedin, New Zealand. The 0.32m
telescope is equipped with a 3072x2048 SBIG STXL6303E camera with an
image scale of 0.88"/pixel, resulting in a 44x30' field of view.
We carried out the spectroscopic observations of TOI-778 using the
Minerva-Australis facility. Minerva-Australis consists of an array of
four independently operated 0.7m CDK700 telescopes situated at the
Mount Kent Observatory in Queensland, Australia. Each telescope
simultaneously feeds stellar light via fiber optic cables to a single
KiwiSpec R4-100 high-resolution (R=80000) spectrograph with wavelength
coverage from 480 to 620nm.
Objects:
--------------------------------------------------------
RA (2000) DE Designation(s) (Period)
--------------------------------------------------------
13 17 20.18 -15 16 24.9 TOI-778 = HD 115447 (4.63d)
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 35 137 Radial velocities for TOI-778
fig1.dat 35 31134 Full TESS PDCSAP median corrected light curves for
TOI-778 from Sector 10 and Sector 37
fig6.dat 39 4283 Light curve for TOI-778b from the ground-based
observations
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See also:
III/135 : Henry Draper Catalogue and Extension (Cannon+ 1918-1924; ADC 1989)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
J/ApJ/720/1118 : i-band photometry of HAT-P-16 (Buchhave+, 2010)
J/A+A/529/A75 : Limb-darkening coefficients (Claret+, 2011)
J/AJ/142/19 : Speckle observations of KOI (Howell+, 2011)
J/ApJ/757/18 : Radial velocities 16 hot Jupiter host stars (Albrecht+, 2012)
J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)
J/AJ/153/71 : Kepler followup observation program I. Imaging (Furlan+, 2017)
J/MNRAS/480/2846 : 95 RV-discovered single-planet systems (Boisvert+, 2018)
J/AJ/157/192 : Radial velocities and transit times for KOI 4 (Chontos+, 2019)
J/AJ/158/227 : Asteroseismic parameters of RGB stars (Grunblatt+, 2019)
J/AJ/157/31 : Differential photometry & RVel of HATS-70 (Zhou+, 2019)
J/AJ/158/141 : Differential photometry & RVs of HATP69 & HATP70 (Zhou+, 2019)
J/AJ/159/145 : RVs & opt. photometry of the host star TOI-677 (Jordan+, 2020)
J/AJ/162/292 : RVel and transit photometry of TOI-1431 (Addison+, 2021)
J/AJ/162/176 : The solar neighborhood. XLVIII. (Paredes+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.5 d BJD [2458647/2459006] Barycentric Julian Date
15- 19 I5 m/s RVel [-7318/688] Radial velocity
21- 23 I3 m/s e_RVel [56/430] Uncertainty in RVel
25- 26 I2 --- SNR [5/79] Signal-to-Noise
28- 35 A8 --- Inst Instrument (1)
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Note (1): M-A is Minerva-Australis
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Byte-by-byte Description of file: fig1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Sector TESS sector number; 10 or 37
4- 4 I1 --- Part Part in Figure 1; either 1 or 2
6- 19 F14.6 d BJD [2458571/2459333] Barycentric Julian Date
21- 27 F7.5 --- Flux [0.99/1.01] Relative flux
29- 35 F7.5 --- e_Flux [0.0005/0.0007] Uncertainty in Flux
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Byte-by-byte Description of file: fig6.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Inst Facility identifier (1)
10- 23 F14.6 d BJD [2458657/2459006] Barycentric Julian Date
25- 31 F7.5 --- Flux [0.97/1.03] Relative flux
33- 39 F7.5 --- e_Flux [0.0008/0.009] Uncertainty in Flux
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Note (1): Instruments as follows:
LCOMcD = Las Cumbres Observatory 1m telescope at McDonald Observatory.
LCOSAAO = Las Cumbres Observatory 1m telescope at South Africa Astronomical
Observatory.
MtKent = Mount Kent Observatory;
MtStuart = The 0.32m telescope at Mt. Stuart Observatory;
NGTS = Next Generation Transit Survey;
PEST = The 0.3m Perth Exoplanet Survey Telescope.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 29-Sep-2023