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5021. Photometry and spectroscopy of CF Tauri
ID:
ivo://CDS.VizieR/J/AJ/144/167
Title:
Photometry and spectroscopy of CF Tauri
Short Name:
J/AJ/144/167
Date:
21 Oct 2021
Publisher:
CDS
Description:
CF Tau is now known to be an eclipsing triple star with relatively deep total and annular eclipses. New light and radial velocity curves as well as new times of minima were obtained and used for further modeling of the system. Very accurate (better than 0.9%) masses and radii of the eclipsing pair are determined from analysis of the two new light curves, the radial velocity curve, and the times of minimum light. The mass and luminosity of the distant third component is accurately determined as well. Theoretical models of the detached, evolved eclipsing pair match the observed absolute properties of the stars at an age of about 4.3Gyr and [Fe/H]=-0.14.
5022. Photometry and Spectroscopy of Elliptical Galaxies
ID:
ivo://CDS.VizieR/VII/176A
Title:
Photometry and Spectroscopy of Elliptical Galaxies
Short Name:
VII/176A
Date:
21 Oct 2021
Publisher:
CDS
Description:
Photometric and spectroscopic data are presented for a survey of the nearest and brightest elliptical galaxies. Distances, velocities relative to the cosmic rest frame, and residual velocities relative to a velocity-flow model are calculated for individual galaxies and groups. Information is provided on the selection and completeness of the target and observed samples. Both samples appear to be noticeably deeper in the north than in the south. A new diameter system for ellipticals is described that is easy to measure on survey prints and is a useful indicator of B_T_ magnitude.
5023. Photometry and spectroscopy of EPIC 201702477
ID:
ivo://CDS.VizieR/J/AJ/153/15
Title:
Photometry and spectroscopy of EPIC 201702477
Short Name:
J/AJ/153/15
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the discovery of EPIC 201702477b, a transiting brown dwarf in a long period (40.73691+/-0.00037day) and eccentric (e=0.2281+/-0.0026) orbit. This system was initially reported as a planetary candidate based on two transit events seen in K2 Campaign 1 photometry and later validated as an exoplanet candidate. We confirm the transit and refine the ephemeris with two subsequent ground-based detections of the transit using the Las Cumbres Observatory Global Telescope 1m telescope network. We rule out any transit timing variations above the level of ~30s. Using high precision radial velocity measurements from HARPS and SOPHIE we identify the transiting companion as a brown dwarf with a mass, radius, and bulk density of 66.9+/-1.7M_J_, 0.757+/-0.065R_J_, and 191+/-51g/cm^3^ respectively. EPIC 201702477b is the smallest radius brown dwarf yet discovered, with a mass just below the H-burning limit. It has the highest density of any planet, substellar mass object, or main-sequence star discovered so far. We find evidence in the set of known transiting brown dwarfs for two populations of objects-high mass brown dwarfs and low mass brown dwarfs. The higher-mass population have radii in very close agreement to theoretical models, and show a lower-mass limit around 60M_J_. This may be the signature of mass-dependent ejection of systems during the formation process.
5024. Photometry and spectroscopy of HAT-P-56
ID:
ivo://CDS.VizieR/J/AJ/150/85
Title:
Photometry and spectroscopy of HAT-P-56
Short Name:
J/AJ/150/85
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the discovery of HAT-P-56b by the HATNet survey, an inflated hot Jupiter transiting a bright F-type star in Field 0 of NASA's K2 mission. We combine ground-based discovery and follow-up light curves with high precision photometry from K2, as well as ground-based radial velocities from the Tillinghast Reflector Echelle Spectrograph on the Fred Lawrence Whipple Observatory 1.5m telescope to determine the physical properties of this system. HAT-P-56b has a mass of 2.18M_J_, radius of 1.47R_J_, and transits its host star on a near-grazing orbit with a period of 2.7908day. The radius of HAT-P-56b is among the largest known for a planet with M_P_>2M_J_. The host star has a V-band magnitude of 10.9, mass of 1.30M_{sun}_, and radius of 1.43R_{sun}_. The periodogram of the K2 light curve suggests that the star is a {gamma} Dor variable. HAT-P-56b is an example of a ground-based discovery of a transiting planet, where space-based observations greatly improve the confidence in the confirmation of its planetary nature, and also improve the accuracy of the planetary parameters.
5025. Photometry and spectroscopy of HAT-P-57
ID:
ivo://CDS.VizieR/J/AJ/150/197
Title:
Photometry and spectroscopy of HAT-P-57
Short Name:
J/AJ/150/197
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the discovery of HAT-P-57b, a P=2.4653 day transiting planet around a V=10.465+/-0.029mag, T_eff_=7500+/-250K main sequence A8V star with a projected rotation velocity of vsini=102.1+/-1.3km/s. We measure the radius of the planet to be R=1.413+/-0.054R_J_ and, based on RV observations, place a 95% confidence upper limit on its mass of M<1.85M_J_. Based on theoretical stellar evolution models, the host star has a mass and radius of 1.47+/-0.12M_{sun}_ and 1.500+/-0.050R_{sun}_, respectively. Spectroscopic observations made with Keck-I/HIRES during a partial transit event show the Doppler shadow of HAT-P-57b moving across the average spectral line profile of HAT-P-57, confirming the object as a planetary system. We use these observations, together with analytic formulae that we derive for the line profile distortions, to determine the projected angle between the spin axis of HAT-P-57 and the orbital axis of HAT-P-57b. The data permit two possible solutions, with -16.7{deg}<{lambda}<3.3{deg} or 27.6{deg}<{lambda}<57.4{deg} at 95% confidence, and with relative probabilities for the two modes of 26% and 74%, respectively. Adaptive optics imaging with MMT/Clio2 reveals an object located 2.7" from HAT-P-57 consisting of two point sources separated in turn from each other by 0.22". The H- and L'-band magnitudes of the companion stars are consistent with their being physically associated with HAT-P-57, in which case they are stars of mass 0.61+/-0.10M_{sun}_ and 0.53+/-0.08M_{sun}_. HAT-P-57 is the most rapidly rotating star, and only the fourth main sequence A star, known to host a transiting planet.
5026. Photometry and spectroscopy of HAT-P-54
ID:
ivo://CDS.VizieR/J/AJ/149/149
Title:
Photometry and spectroscopy of HAT-P-54
Short Name:
J/AJ/149/149
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the discovery of HAT-P-54b, a planet transiting a late K dwarf star in field 0 of the NASA K2 mission. We combine ground-based photometric light curves with radial velocity measurements to determine the physical parameters of the system. HAT-P-54b has a mass of 0.760+/0.032M_J_, a radius of 0.944+/-0.028R_J_, and an orbital period of 3.7998days. The star has V=13.505+/0.060, a mass of 0.645+/-0.020M_{sun}_, a radius of 0.617+/-0.013R_{sun}_, an effective temperature of T_eff*_=4390+/-50, and a subsolar metallicity of [Fe/H]=-0.127+/-0.080. We also detect a periodic signal with P=15.6days and 5.6mmag amplitude in the light curve, which we interpret as due to the rotation of the star. HAT-P-54b has a radius that is smaller than 92% of the known transiting planets with masses greater than that of Saturn, while HAT-P-54 is one of the lowest-mass stars known to host a hot Jupiter. Follow-up high-precision photometric observations by the K2 mission promise to make this a well-studied planetary system.
5027. Photometry and spectroscopy of HAT-P-49
ID:
ivo://CDS.VizieR/J/AJ/147/84
Title:
Photometry and spectroscopy of HAT-P-49
Short Name:
J/AJ/147/84
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the discovery of the transiting extrasolar planet HAT-P-49b. The planet transits the bright (V=10.3) slightly evolved F-star HD340099 with a mass of 1.54M_{Sun}_ and a radius of 1.83R_{Sun}_. HAT-P-49b is orbiting one of the 25 brightest stars to host a transiting planet which makes this a favorable candidate for detailed follow-up. This system is an especially strong target for Rossiter-McLaughlin follow-up due to the host star's fast rotation, 16km/s. The planetary companion has a period of 2.6915 days, mass of 1.73M_J_, and radius of 1.41R_J_. The planetary characteristics are consistent with that of a classical hot Jupiter but we note that this is the fourth most massive star to host a transiting planet with both M_p_ and R_p_ well determined.
5028. Photometry and spectroscopy of HATS-8
ID:
ivo://CDS.VizieR/J/AJ/150/49
Title:
Photometry and spectroscopy of HATS-8
Short Name:
J/AJ/150/49
Date:
21 Oct 2021
Publisher:
CDS
Description:
HATS-8b is a low density transiting super-Neptune discovered as part of the HATSouth project. The planet orbits its solar-like G-dwarf host (V=14.03+/-0.10, T_eff_=50K) with a period of 3.5839days. HATS-8b is the third lowest-mass transiting exoplanet to be discovered from a wide-field ground-based search, and with a mass of 0.138+/0.019M_J_ it is approximately halfway between the masses of Neptune and Saturn. However, HATS-8b has a radius of 0.873^+0.123^_-0.075_, resulting in a bulk density of just 0.259+/-0.091g/cm3. The metallicity of the host star is super-solar ([Fe/H]=0.210+/-0.080), providing evidence against the idea that low-density exoplanets form from metal-poor environments. The low density and large radius of HATS-8b results in an atmospheric scale height of almost 1000km, and in addition to this there is an excellent reference star of nearly equal magnitude at just 19'' separation in the sky. These factors make HATS-8b an exciting target for future atmospheric characterization studies, particularly for long-slit transmission spectroscopy.
5029. Photometry and spectroscopy of HATS-6
ID:
ivo://CDS.VizieR/J/AJ/149/166
Title:
Photometry and spectroscopy of HATS-6
Short Name:
J/AJ/149/166
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the discovery by the HATSouth survey of HATS-6b, an extrasolar planet transiting a V=15.2mag, i=13.7mag M1V star with a mass of 0.57M_{Sun}_ and a radius of 0.57R_{sun}_ . HATS-6b has a period of P=3.3253d, mass of M_p_=0.32M_J_, radius of R_p_=1.00R_J_, and zero-albedo equilibrium temperature of T_eq_=712.8+/-5.1K. HATS-6 is one of the lowest mass stars known to host a close-in gas giant planet, and its transits are among the deepest of any known transiting planet system. We discuss the follow-up opportunities afforded by this system, noting that despite the faintness of the host star, it is expected to have the highest K-band S/N transmission spectrum among known gas giant planets with T_eq_<750K. In order to characterize the star we present a new set of empirical relations between the density, radius, mass, bolometric magnitude, and V-, J-, H- and K-band bolometric corrections for main sequence stars with M<0.80M_{Sun}_, or spectral types later than K5. These relations are calibrated using eclipsing binary components as well as members of resolved binary systems. We account for intrinsic scatter in the relations in a self-consistent manner. We show that from the transit-based stellar density alone it is possible to measure the mass and radius of a ~0.6M_{Sun}_ star to ~7 and ~2% precision, respectively. Incorporating additional information, such as the V-K color, or an absolute magnitude, allows the precision to be improved by up to a factor of two.
5030. Photometry and spectroscopy of HATS-9 and HATS-10
ID:
ivo://CDS.VizieR/J/AJ/150/33
Title:
Photometry and spectroscopy of HATS-9 and HATS-10
Short Name:
J/AJ/150/33
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report the discovery of two transiting extrasolar planets by the HATSouth survey. HATS-9b orbits an old (10.8+/-1.5Gyr) V=13.3 G dwarf star with a period p~~1.9153days. The host star has a mass of 1.03M_{sun}_, radius of 1.503R_{sun}_, and effective temperature 5366+/-70K. The planetary companion has a mass of 0.837M_J_ and radius of 1.065R_J_, yielding a mean density of 0.85g/cm^-3^. HATS-10b orbits a V=13.1 G dwarf star with a period p~~3.3128days. The host star has a mass of 1.1M_{sun}_, radius of 1.11R_{sun}_, and effective temperature 5880+/-120K. The planetary companion has a mass of 0.53M_J_ and radius of 0.97R_J_, yielding a mean density of 0.7g/cm3. Both planets are compact in comparison with planets receiving similar irradiation from their host stars and lie in the nominal coordinates of Field 7 of K2, but only HATS-9b falls on working silicon. Future characterization of HATS-9b with the exquisite photometric precision of the Kepler telescope may provide measurements of its reflected light signature.