J/AJ/158/63 Five new transiting hot Jupiters:HATS-54b-HATS-58b (Espinoza+, 2019)
HATS-54b-HATS-58Ab: five new transiting hot Jupiters including one with
a possible temperate companion.
Espinoza N., Hartman J.D., Bakos G.A., Henning T., Bayliss D., Bento J.,
Bhatti W., Brahm R., Csubry Z., Suc V., Jordan A., Mancini L., Tan T.G.,
Penev K., Rabus M., Sarkis P., de Val-Borro M., Durkan S., Lazar J.,
Papp I., Sari P.
<Astron. J., 158, 63-63 (2019)>
=2019AJ....158...63E 2019AJ....158...63E (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry ; Optical ;
Radial velocities
Keywords: planets and satellites: detection -
planets and satellites: individual: HATS-54b, HATS-55b, HATS-56b,
HATS-57b, HATS-58b
Abstract:
We report the discovery by the HATSouth project of five new transiting
hot Jupiters (HATS-54b through HATS-58Ab). HATS-54b, HATS-55b, and
HATS-58Ab are prototypical short-period (P=2.5-4.2 days, Rp∼1.1-1.2 RJ)
hot Jupiters that span effective temperatures from 1350 to 1750 K, putting
them in the proposed region of maximum radius inflation efficiency. The
HATS-58 system is composed of two stars, HATS-58A and HATS-58B, which are
detected thanks to Gaia DR2 data and which we account for in the joint
modeling of the available data-with this, we are led to conclude that the
hot Jupiter orbits the brighter HATS-58A star. HATS-57b is a short-period
(2.35 day), massive (3.15 MJ), 1.14 RJ, dense (2.65±0.21 g/cm3)
hot Jupiter orbiting a very active star (2% peak-to-peak flux variability).
Finally, HATS-56b is a short-period (4.32 day), highly inflated hot Jupiter
(1.7 RJ, 0.6 MJ), which is an excellent target for future atmospheric
follow-up, especially considering the relatively bright nature (V=11.6)
of its F dwarf host star. This latter exoplanet has another very
interesting feature: the radial velocities show a significant quadratic
trend. If we interpret this quadratic trend as arising from the pull
of an additional planet in the system, we obtain a period of
Pc=815-143+253 days for the possible planet HATS-56c, and a minimum
mass of Mcsinic=5.11±0.94 MJ. The candidate planet HATS-56c would
have a zero-albedo equilibrium temperature of Teq=332±50 K, and
thus would be orbiting close to the habitable zone of HATS-56. Further
radial-velocity follow-up, especially over the next two years, is needed
to confirm the nature of HATS-56c.
Description:
The photometric detection of the exoplanets presented in this work was
made with the HATSouth units based in Las Campanas Observatory (LCO;
HS-1 and HS-2), at the HESS site in Namibia (HS-3 and HS-4), and at the
site in Siding Spring Observatory (SSO; HS-5 and HS-6), the operations
of which are described in detail in Bakos et al. (2013PASP..125..154B 2013PASP..125..154B).
High-precision spectroscopy was performed with both the FEROS
(Kaufer & Pasquini 1998SPIE.3355..844K 1998SPIE.3355..844K) and HARPS (Mayor et al.
2003Msngr.114...20M 2003Msngr.114...20M) spectrographs, which are located at the MPG 2.2 m
telescope and 3.6 m ESO telescope, respectively, at LSO.
Objects:
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RA (ICRS) DE Designation(s) (Period)
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13 22 32.37 -44 41 19.7 HATS-54 = 2MASS J13223237-4441196 (P=2.5441828)
07 37 08.02 -32 45 19.5 HATS-55 = 2MASS J07370802-3245195 (P=4.2042001)
12 00 39.63 -45 47 58.0 HATS-56 = 2MASS J12003962-4547579 (P=4.324799)
04 03 47.60 -19 03 24.3 HATS-57 = 2MASS J04034760-1903242 (P=2.350621)
12 27 08.99 -48 58 42.4 HATS-58 = 2MASS J12270898-4858423 (P=4.2180896)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 67 83185 Lightcurve data for HATS-54, HATS-55, HATS-56,
HATS-57 and HATS-58
table4.dat 64 136 Relative radial velocities and bisector spans
for HATS-54-HATS-58
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See also:
J/AJ/155/112 : Radial velocities & light curves for HATS-43-HATS-46
(Brahm+, 2018)
J/AJ/156/216 : Differential photometry & RVs of HATS-59 (Sarkis+, 2018)
J/AJ/157/55 : RVs and light curves for HATS-60-HATS-69 (Hartman+, 2019)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- ID System identifier (HATS-54-HATS-58)
9- 21 F13.5 d BJD Barycentric Julian Date (G1)
23- 30 F8.5 mag mag [-0.05073/0.0465] Out-of-transit subtracted
magnitude (1)
32- 38 F7.5 mag e_mag [0/0.02221] Uncertainty in mag
40- 47 F8.5 mag omag [-0.0203/13.8777]? Raw magnitude in Filt (2)
49- 50 A2 --- Filt [RRc gri] Filter used in the observation
52- 67 A16 --- Inst Instrument (3)
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Note (1): The out-of-transit level has been subtracted. For observations made
with the HATSouth instruments (identified by "HS" in the "Inst" column) these
magnitudes have been corrected for trends using the external parameter
decorrelation (EPD) and trend filtering algorithm (TFA) procedures applied
prior to fitting the transit model. This procedure may lead to an artificial
dilution in the transit depths. The blend factors for the HATSouth light curves
are listed in Table 6. For observations made with follow-up instruments
(anything other than "HS" in the "Inst" column), the magnitudes have been
corrected for a quadratic trend in time, and for variations correlated with up
to three PSF shape parameters, fit simultaneously with the transit.
Note (2): Raw magnitude values without correction for the quadratic trend in
time, or for trends correlated with the seeing. These are only reported for
the follow-up observations.
Note (3): Instrument as follows:
CHAT0.7m = 0.7m Chilean-Hungarian Automated Telescope at LCO;
HS = HATSouth units based in Las Campanas Observatory (LCO;
HS-1 and HS-2), at the HESS site in Namibia (HS-3 and HS-4)
and at the site in Siding Spring Observatory (SSO; HS-5 and
HS-6);
LCO1m = LCOGT 1m;
LCO1m/CTIO/DomeA = LCOGT 1m at CTIO Dome A;
LCO1m/CTIO/DomeC = LCOGT 1m at CTIO Dome C;
PEST0.3m = 0.3m Perth Exoplanet Survey Telescope;
Swope1m = 1m Swope Telescope at Las Campanas Observatory.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- ID Object identifier (HATS-54-HATS-58)
9- 21 F13.5 d BJD Barycentric Julian Date (G1)
23- 29 F7.2 m/s RV [-515.34/482.36] Radial velocity (1)
31- 35 F5.2 m/s e_RV [6.6/59] The 1σ uncertainty in RV (2)
37- 43 F7.2 m/s BS [-129/197] Bisector span
45- 49 F5.2 m/s e_BS [6/77] The 1σ uncertainty in BS
51- 58 F8.6 --- Phase Orbital phase
60- 64 A5 --- Inst Instrument used (FEROS or HARPS)
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Note (1): The zero-point of these velocities is arbitrary. An overall offset
fitted independently to the velocities from each instrument has been
subtracted.
Note (2): Internal errors excluding the component of astrophysical jitter
considered in Section 3.3.
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Global notes:
Note (G1): Barycentric Julian Date is computed directly from the UTC time
without correction for leap seconds.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 25-Sep-2019