8 research outputs found
The first planet detected in the WTS: an inflated hot-Jupiter in a 3.35 d orbit around a late F star [Erratum]
We report the discovery of WTS-1b, the first extrasolar planet found by the
WFCAM Transit Survey, which began observations at the 3.8-m United Kingdom
Infrared Telescope (UKIRT) in August 2007. Light curves comprising almost 1200
epochs with a photometric precision of better than 1 per cent to J ~ 16 were
constructed for ~60000 stars and searched for periodic transit signals. For one
of the most promising transiting candidates, high-resolution spectra taken at
the Hobby-Eberly Telescope (HET) allowed us to estimate the spectroscopic
parameters of the host star, a late-F main sequence dwarf (V=16.13) with
possibly slightly subsolar metallicity, and to measure its radial velocity
variations. The combined analysis of the light curves and spectroscopic data
resulted in an orbital period of the substellar companion of 3.35 days, a
planetary mass of 4.01 +- 0.35 Mj and a planetary radius of 1.49+0.16-0.18 Rj.
WTS-1b has one of the largest radius anomalies among the known hot Jupiters in
the mass range 3-5 Mj. The high irradiation from the host star ranks the planet
in the pM class.Comment: 16 pages, 10 figure
All-Sky RR Lyrae Stars in the Gaia Data
The second Gaia data release is expected to contain data products from about
22 months of observation. Based on these data, we aim to provide an advance
publication of a full-sky Gaia map of RR Lyrae stars. Although comprehensive,
these data still contain a significant fraction of sources which are
insufficiently sampled for Fourier series decomposition of the periodic light
variations. The challenges in the identification of RR Lyrae candidates with
(much) fewer than 20 field-of-view transits are described. General
considerations of the results, their limitations, and interpretation are
presented together with prospects for improvement in subsequent Gaia data
releases.Comment: 5 pages, 1 figure, Proceedings of the RR Lyrae 2017 Conference
(Revival of the Classical Pulsators: from Galactic Structure to Stellar
Interior Diagnostics), to be published in the Proceedings of the Polish
Astronomical Societ
The first planet detected in the WTS: an inflated hot Jupiter in a 3.35 d orbit around a late F star
We report the discovery of WTS-1b, the first extrasolar planet found by the WFCAM Transit Survey, which began observations at the 3.8-m United Kingdom Infrared Telescope (UKIRT) in 2007 August. Light curves comprising almost 1200 epochs with a photometric precision of better than 1 per cent to J ˜ 16 were constructed for ˜60 000 stars and searched for periodic transit signals. For one of the most promising transiting candidates, high-resolution spectra taken at the Hobby-Eberly Telescope (HET) allowed us to estimate the spectroscopic parameters of the host star, a late-F main-sequence dwarf (V = 16.13) with possibly slightly subsolar metallicity, and to measure its radial velocity variations. The combined analysis of the light curves and spectroscopic data resulted in an orbital period of the substellar companion of 3.35 d, a planetary mass of 4.01 ± 0.35 MJ and a planetary radius of 1.49-0.18+0.16 RJ. WTS-1b has one of the largest radius anomalies among the known hot Jupiters in the mass range 3-5 MJ. The high irradiation from the host star ranks the planet in the pM class
Gaia DR3 documentation Chapter 20: Datamodel description
This chapter of the Gaia DR3 documentation describes the Gaia DR3 data model
Gaia DR3 documentation
The data collected during the first 34 months of the Gaia mission have been processed by the Gaia Data Processing and Analysis Consortium (DPAC), resulting in Gaia's third data release, Gaia DR3. Gaia DR3 contains the astrometry and broad-band photometry already published as part of Gaia EDR3 and introduces a large variety of new data products. A summary of the release properties is provided in Gaia Collaboration et al. (2022). The overall scientific validation of the data is described in Babusiaux et al. (2022) and Fabricius et al. (2021) (astrometry and broad-band photometry). Background information on the Gaia mission and the spacecraft can be found in Gaia Collaboration et al. (2016). In addition, Gaia DR3 is accompanied by dedicated processing papers, all part of a Special Issue of A&A, that describe the processing and validation of the various data products. The data release documentation provides complementary information to the processing papers. Finally, nine performance verification papers accompanying Gaia DR3 co-authored by the Gaia Collaboration provide an impression on the immense scientific potential of this release
The Gaia-ESO Public Spectroscopic Survey
The Gaia-ESO Public Spectroscopic Survey has begun and will obtain high quality spectroscopy of some 100000 Milky Way stars, in the field and in open clusters, down to magnitude 19, systematically covering all the major components of the Milky Way. This survey will provide the first homogeneous overview of the distributions of kinematics and chemical element abundances in the Galaxy. The motivation, organisation and implementation of the Gaia-ESO Survey are described, emphasising the complementarity with the ESA Gaia mission. Spectra from the very first observing run of the survey are presented