J/AJ/155/119 HATSouth-K2 C7 transiting/eclipsing systems (Bayliss+, 2018)
HATS-36b and 24 other transiting/eclipsing systems from the HATSouth-K2
Campaign 7 program.
Bayliss D., Hartman J.D., Zhou G., Bakos G.A., Vanderburg A., Bento J.,
Mancini L., Ciceri S., Brahm R., Jordan A., Espinoza N., Rabus M., Tan T.G.,
Penev K., Bhatti W., de Val-Borro M., Suc V., Csubry Z., Henning T.,
Sarkis P., Lazar J., Papp I., Sari P.
<Astron. J., 155, 119 (2018)>
=2018AJ....155..119B 2018AJ....155..119B (SIMBAD/NED BibCode)
ADC_Keywords: Exoplanets ; Stars, double and multiple ; Stars, diameters ;
Photometry, ugriz ; Effective temperatures ; Radial velocities
Keywords: planetary systems - stars: individual (HATS-36) -
techniques: photometric - techniques: spectroscopic
Abstract:
We report on the result of a campaign to monitor 25 HATSouth candidates
using the Kepler space telescope during Campaign 7 of the K2 mission.
We discover HATS-36b (EPIC 215969174b, K2-145b), an eccentric
(e=0.105±0.028) hot Jupiter with a mass of 3.216±0.062 MJ and a
radius of 1.235±0.043 RJ, which transits a solar-type G0V star
(V=14.386) in a 4.1752-day period. We also refine the properties of three
previously discovered HATSouth transiting planets (HATS-9b, HATS-11b,
and HATS-12b) and search the K2 data for TTVs and additional transiting
planets in these systems. In addition, we also report on a further three
systems that remain as Jupiter-radius transiting exoplanet candidates.
These candidates do not have determined masses, however pass all of
our other vetting observations. Finally, we report on the 18 candidates
that we are now able to classify as eclipsing binary or blended eclipsing
binary systems based on a combination of the HATSouth data, the K2 data,
and follow-up ground-based photometry and spectroscopy. These range in
periods from 0.7 day to 16.7 days, and down to 1.5 mmag in eclipse depths.
Our results show the power of combining ground-based imaging and
spectroscopy with higher precision space-based photometry, and serve
as an illustration as to what will be possible when combining
ground-based observations with TESS data.
Description:
The HATSouth global telescope network consists of six HS4 units, two
each at Siding Spring Observatory (SSO), Las Campanas Observatory
(LCO), and the High Energy Spectroscopic Survey (H.E.S.S.) site. Each
HS4 unit holds four Takahashi astrographs (f/2.8, 18 cm apertures),
which are each coupled to an Apogee U16M 4Kx4K CCD camera. Imaging is
performed using Sloan r-band filters and with exposure times of 240 s.
A full description of the HATSouth telescope network hardware and
operations can be found in Bakos et al. (2013PASP..125..154B 2013PASP..125..154B). As part
of the HATSouth survey (http://hatsouth.org/), we monitored a 64
square degree field (centered at 19h30m00s, -22°30'00") between
2010 March to 2011 August. In total, we obtained 10137 images, with a
cadence of approximately 300 s.
We found 25 candidates with transit-like signals that were also were
on-silicon for the K2 Campaign 7 (see Section 2.5). We designate these
as "HS-K2C7 candidates", and summarize them in Table 1.
As part of the usual HATSouth program to follow-up transiting planet
candidates, follow-up spectroscopy was obtained for the HS-K2C7
candidates, primarily using WiFeS (Dopita et al. 2007Ap&SS.310..255D 2007Ap&SS.310..255D) on
the ANU 2.3 m telescope at SSO. Full details for this observing program
are given in Bayliss et al. (2013, J/AJ/146/113).
Objects:
----------------------------------------------------------------------------
RA (ICRS) DE Designation(s) (Period)
----------------------------------------------------------------------------
19 25 54.89 -23 12 10.0 HATS-36b = NAME EPIC 215969174b (P=4.1752387)
----------------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 125 25 Basic data for the HS-K2C7 transiting exoplanet
candidates
table4.dat 104 25 HS-K2C7 candidate classifications
table5.dat 47 16 Relative radial velocities and bisector span
measurements of HATS-36
table3.dat 62 14560 Differential photometry of HS-K2C7 candidates
--------------------------------------------------------------------------------
See also:
IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)
J/AJ/146/113 : Differential griz photometry of HATS-3 (Bayliss+, 2013)
J/AJ/150/33 : Photometry and spectroscopy of HATS-9 and HATS-10 (Brahm+, 2015)
J/AJ/152/88 : Spectroscopy and photometry of HATS-11 and HATS-12
(Rabus+, 2016)
J/AJ/155/21 : Planet candidates from K2 campaigns 5-8 (Petigura+, 2018)
http://hatsouth.org/ : The HATSouth exoplanet survey website
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [EPIC]
6- 14 I9 --- EPIC [214439239/218210199] EPIC number
16- 21 A6 --- K2 K2 identifier (K2-NNN)
23- 33 A11 --- HATS HATS identifier (HATS-NN or HATSFFF-NNN)
35- 40 F6.3 mag rmag [12.654/15.881] r band magnitude (1)
42- 43 I2 h RAh Hour of Right Ascension (J2000)
45- 46 I2 min RAm Minute of Right Ascension (J2000)
48- 52 F5.2 s RAs Second of Right Ascension (J2000)
54 A1 --- DE- Sign of the Declination (J2000)
55- 56 I2 deg DEd Degree of Declination (J2000)
58- 59 I2 arcmin DEm Arcminute of Declination (J2000)
61- 64 F4.1 arcsec DEs Arcsecond of Declination (J2000)
66- 75 F10.7 d Per [0.642581/16.6924091] Period (2)
77- 85 F9.7 d e_Per [1e-06/4.64e-05] Uncertainty in Per (2)
87- 93 F7.5 --- Rp/R* [0.04817/0.25501] Planet to stellar radii ratio
(2)
95-101 F7.5 --- e_Rp/R* [0.00067/0.00469] Uncertainty in Rp/R* (2)
103-116 F14.6 d Tc Central transit time (BJD) (2)
118-125 F8.6 d e_Tc Uncertainty in Tc (2)
--------------------------------------------------------------------------------
Note (1): r band magnitude from APASS (Henden et al. 2009AAS...21440702H).
Note (2): Period, Rp/R*, and Tc from combined HATSouth + K2 data.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [EPIC]
6- 14 I9 --- EPIC [214439239/218210199] EPIC number
16- 26 A11 --- HATS HATS identifier (HATS-NN or HATSFFF-NNN)
27 A1 --- n_HATS [b] Note on HATS (1)
29- 32 I4 K Teff [4765/6700]? Effective temperature
34- 36 I3 K e_Teff [100/300]? Uncertainty in Teff
38 A1 --- l_K [<] Limit flag on K
39- 45 F7.3 km/s K [-16.64/54.92]? Radial velocity semi-amplitude
47- 51 F5.3 km/s e_K [0.01/2.71]? Uncertainty in K
53- 55 A3 --- Ecl [YES NO] Secondary eclipse in the K2 lightcurve?
57- 60 A4 --- Class Classification (2)
62-104 A43 --- Com Comment
--------------------------------------------------------------------------------
Note (1): Note as follows:
b = We note that the spectrum of HATS579-014 showed that the candidate was
a spectroscopic binary.
Note (2): Classification as follows:
TEP = Transiting exoplanet;
CAND = Candidate;
EB = Eclipsing binary;
BEB = Blended eclipsing binary.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.5 d BJD [6489.79/6862.65477] Barycentric Julian Date
(BJD-2450000)
12- 18 F7.2 m/s RV [-315.43/424.37] Radial velocity (1)
20- 24 F5.2 m/s e_RV [13.3/26.9] Uncertainty in RV (2)
26- 30 F5.1 m/s BS [-76/141] Bisector span
32- 35 F4.1 m/s e_BS [15/26] Uncertainty in BS
37- 41 F5.3 --- Phase [0.076/0.987] Phase
43- 47 A5 --- Inst Instrument (FEROS)
--------------------------------------------------------------------------------
Note (1): The zero-point of these velocities is arbitrary. An overall offset
γrel fitted separately to the FEROS velocities in Section 3 has been
subtracted.
Note (2): Internal errors excluding the component of astrophysical/instrumental
jitter considered in Section 3.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- Star Stellar identifier (HATS-36)
9- 19 F11.5 d BJD [55267.8996/57382.84606] Barycentric Julian Date
(BJD-2400000)
21- 28 F8.5 mag magCor [-0.08555/0.05502] Corrected magnitude in Filt
30- 36 F7.5 mag e_magCor [0.00021/0.04285] Error in magCor
38- 45 F8.5 mag Omag [-0.00617/14.4855]? Original magnitude in Filt
47- 48 A2 --- Filt [Kp Rc griz] Filter used
50- 62 A13 --- Inst Instrument
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 05-Nov-2018