- ID:
- ivo://CDS.VizieR/J/AJ/156/28
- Title:
- Properties for exoplanets with Spitzer light curves
- Short Name:
- J/AJ/156/28
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a uniform assessment of existing near-infrared Spitzer Space Telescope observations of planet-bearing stars. Using a simple four-parameter blackbody thermal model, we analyze stars for which photometry in at least one of Spitzer's IRAC bands has been obtained over either the entirety or a significant fraction of the planetary orbit. Systems in this category comprise 10 well-studied systems with hot Jupiters on circular or near-circular orbits (HAT-P-7, HD 149026, HD 189733, HD 209458, WASP-12, WASP-14, WASP-18, WASP-19, WASP-33, and WASP-43), as well as three stars harboring planets on significantly eccentric orbits (GJ 436, HAT-P-2, and HD 80606). We find that our simple model, in almost all cases, accurately reproduces the minimum and maximum planetary emission, as well as the phase offsets of these extrema with respect to transits/secondary eclipses. For one notable exception, WASP-12 b, adding an additional parameter to account for its tidal distortion is not sufficient to reproduce its photometric features. Full-orbit photometry is available in multiple wavelengths for 10 planets. We find that the returned parameter values for independent fits to each band are largely in agreement. However, disagreements in nightside temperature suggest distinct atmospheric layers, each with their own characteristic minimum temperature. In addition, a diversity in albedos suggests variation in the opacity of the photospheres. While previous works have pointed out trends in photometric features based on system properties, we cannot conclusively identify analogous trends for physical model parameters. To make the connection between full-phase data and physical models more robust, a higher signal-to-noise ratio must come from both increased resolution and a careful treatment of instrumental systematics.
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- ID:
- ivo://CDS.VizieR/J/MNRAS/435/2077
- Title:
- Properties of Sirius-like binary systems
- Short Name:
- J/MNRAS/435/2077
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Approximately 70% of the nearby white dwarfs appear to be single stars, with the remainder being members of binary or multiple star systems. The most numerous and most easily identifiable systems are those in which the main-sequence companion is an M star, since even if the systems are unresolved the white dwarf either dominates or is at least competitive with the luminosity of the companion at optical wavelengths. Harder to identify are systems where the non-degenerate component has a spectral type earlier than M0 and the white dwarf becomes the less luminous component. Taking Sirius as the prototype, these latter systems are referred to here as 'Sirius like'. There are currently 98 known Sirius-like systems. Studies of the local white dwarf population within 20pc indicate that approximately 8 percent of all white dwarfs are members of Sirius-like systems, yet beyond 20pc the frequency of known Sirius-like systems declines to between 1 and 2 percent, indicating that many more of these systems remain to be found. Estimates are provided for the local space density of Sirius-like systems and their relative frequency among both the local white dwarf population and the local population of A to K main-sequence stars. The great majority of currently unidentified Sirius-like systems will likely turn out to be closely separated and unresolved binaries. Ways to observationally detect and study these systems are discussed.
- ID:
- ivo://CDS.VizieR/J/A+A/386/187
- Title:
- Radial velocities in IC 4651
- Short Name:
- J/A+A/386/187
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The radial-velocity observations were made during the years 1989-1997 with the photoelectric scanner CORAVEL (Mayor, 1985IAUCo..88...35M) on the Danish 1.54-m telescope at ESO, La Silla. The individual mean errors given are computed from the measured S/N ratio and the shape of the cross-correlation profile (see Sect. 2.2 of this paper).
- ID:
- ivo://CDS.VizieR/J/A+A/601/A34
- Title:
- Resolved astrometry of ten O-type binaries
- Short Name:
- J/A+A/601/A34
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Our long-term aim is to derive model-independent stellar masses and distances for long period massive binaries by combining apparent astrometric orbit with double-lined radial velocity amplitudes (SB2).We followed-up ten O+O binaries with AMBER, PIONIER and GRAVITY at the VLTI. Here, we report on 130 astrometric observations over the last seven years. We combined this dataset with distance estimates to compute the total mass of the systems. We also computed preliminary individual component masses for the five systems with available SB2 radial velocities. Nine of the ten binaries have their three-dimensional orbit well constrained. Four of them are known to be colliding wind, non-thermal radio emitters, and thus constitute valuable targets for future high angular resolution radio imaging. Two binaries break the correlation between period and eccentricity tentatively observed in previous studies. This suggests either that massive star formation produces a wide range of systems, or that several binary formation mechanisms are at play. Finally, we found that the use of existing SB2 radial velocity amplitudes can lead to unrealistic masses and distances.If not understood, the biases in radial velocity amplitudes will represent an intrinsic limitation for estimating dynamical masses from SB2+interferometry or SB2+Gaia. Nevertheless, our results can be combined with future Gaia astrometry to measure the dynamical masses and distances of the individual components with an accuracy of 5 to 15%, completely independently of the radial velocities.
- ID:
- ivo://CDS.VizieR/B/sb9
- Title:
- SB9: 9th Catalogue of Spectroscopic Binary Orbits
- Short Name:
- B/sb9
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Ninth Catalogue of Spectroscopic Binary Orbits continues the series of compilations of spectroscopic orbits carried out over the past 35 years by Batten and collaborators (see e.g. Cat. V/64). The catalogue is continuously updated, see http://sb9.astro.ulb.ac.be/ This version is dated 02-May-2011. Previous versions may be found in subdirectories "v00" (April 2005), "v01" (September 2005), etc...
- ID:
- ivo://CDS.VizieR/V/115
- Title:
- Semi-detached eclipsing binaries
- Short Name:
- V/115
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The catalog contains two parts: 96 well known semidetached eclipsing binaries with known photometric and spectroscopic orbits (table1.dat), and 136 semidetached eclipsing binaries with known photometrical orbital elements and unknown spectroscopic orbit (table2.dat).
- ID:
- ivo://CDS.VizieR/J/AJ/158/48
- Title:
- Speckle interferometry at SOAR in 2018
- Short Name:
- J/AJ/158/48
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of speckle interferometric observations at the 4.1 m Southern Astrophysical Research Telescope (SOAR) in 2018 are given, totaling 3097 measurements of 2427 resolved pairs with separations from 11 mas to 5.9" (median 0.15", magnitude difference up to 7 mag) and nonresolutions of 624 targets. This work continues our long-term speckle program. Its main goal is to monitor orbital motion of close binaries, including members of high-order hierarchies and Hipparcos pairs in the solar neighborhood. Also, pre-main-sequence stars in the Orion OB1 association were surveyed, resolving 26 out of 118 targets. In addition, we report the discovery of 35 new companions among field visual multiples (some of which are likely optical) and first-time resolutions of another 31 pairs. By combining the measurements given here with the published ones, we computed 76 orbits for the first time and updated orbital elements of 34 visual binaries. Their periods range from 0.65 to 1100 yr, and their quality varies from first tentative solutions of grade 5 to accurate elements of grades 1 and 2. Finally, a list of 53 spurious pairs discovered by various techniques and unresolved at SOAR is given.
- ID:
- ivo://CDS.VizieR/J/AJ/142/56
- Title:
- Speckle interferometry at the USNO station
- Short Name:
- J/AJ/142/56
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Results are presented for 299 speckle interferometric observations of double stars, obtained in 2008 at the USNO Flagstaff Station using the 1.55m Kaj Strand Astrometric Reflector. Separations range from 0.15" to 9.88", with a median of 2.22". This observing run concentrated on neglected systems, as well as systems in need of improved orbital elements; new orbital solutions have been determined for nine systems as a result.
- ID:
- ivo://CDS.VizieR/J/AJ/135/1334
- Title:
- Speckle interferometry at the USNO station
- Short Name:
- J/AJ/135/1334
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Results are presented for 353 speckle interferometric observations of double stars, obtained in 2003 and 2004 at the USNO Flagstaff Station using the 1.55m Kaj Strand Astrometric Reflector. Separations range from 0.12" to 7.42", with a median of 0.42". These two observing runs concentrated on systems in need of improved orbital elements, and new solutions have been determined for 17 systems as a result.
- ID:
- ivo://CDS.VizieR/J/AJ/156/117
- Title:
- Spectroscopic orbits for late-type stars. II.
- Short Name:
- J/AJ/156/117
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We have determined spectroscopic orbital elements for 13 systems - 10 single-lined binaries and three double-lined binaries. For the three binaries with previously published spectroscopic orbits, we have computed improved or comparable elements. While two systems have relatively short periods between 10 and 19 days, the remaining systems have much longer periods ranging from 604 to 9669 days. One of the single-lined systems, HD 142640, shows both short-period and long-period velocity variations and so is triple. For three systems - HD 59380, HD 160933, and HD 161163 - we have combined our spectroscopic results with Hipparcos astrometric observations to obtain astrometric orbits. For HD 14802 we have determined a joint orbital solution from spectroscopic velocities and interferometric observations. The orbits given here will be useful in combination with future interferometric and Gaia satellite observations.
