HOW TO CONSTRAIN YOUR M DWARF: MEASURING EFFECTIVE TEMPERATURE, BOLOMETRIC LUMINOSITY, MASS, AND RADIUS
- A. Mann, G. Feiden, E. Gaidos, T. Boyajian, K. Braun
- Physics, Geology
- 7 January 2015
Precise and accurate parameters for late-type (late K and M) dwarf stars are important for characterization of any orbiting planets, but such determinations have been hampered by these stars’ complex…
Strong water absorption in the dayside emission spectrum of the planet HD 189733b
- C. Grillmair, A. Burrows, D. Levine
- Physics, GeologyNature
- 11 December 2008
The detection of strong water absorption in a high-signal-to-noise, mid-infrared emission spectrum of the planet itself is reported, finding both a strong downturn in the flux ratio below 10 µm and discrete spectral features that are characteristic of strong absorption by water vapour.
THE PTF ORION PROJECT: A POSSIBLE PLANET TRANSITING A T-TAURI STAR
- J. V. Eyken, D. Ciardi, J. Surace
- Physics, Geology
- 7 June 2012
We report observations of a possible young transiting planet orbiting a previously known weak-lined T-Tauri star in the 7–10 Myr old Orion-OB1a/25-Ori region. The candidate was found as part of the…
Stellar diameters and temperatures - VI. High angular resolution measurements of the transiting exoplanet host stars HD 189733 and HD 209458 and implications for models of cool dwarfs
- T. Boyajian, K. Braun, L. Sturmann
- Physics, Geology
- 20 November 2014
We present direct radii measurements of the well-known transiting exoplanet host stars HD 189733 and HD 209458 using the CHARA Array interferometer. We find the limbdarkened angular diameters to be…
The exoplanet eccentricity distribution from Kepler planet candidates
The eccentricity distribution of exoplanets is known from radial velocity surveys to be divergent from circular orbits beyond 0.1 au. This is particularly the case for large planets where the radial…
Stellar diameters and temperatures - V. 11 newly characterized exoplanet host stars
- K. Braun, T. Boyajian, Noao
- Physics, Geology
- 6 December 2013
We use near-infrared interferometric data coupled with trigonometric parallax values and spectral energy distribution fitting to directly determine stellar radii, effective temperatures and…
Multiwavelength Monitoring of the Narrow-Line Seyfert 1 Galaxy Arakelian 564. III. Optical Observations and the Optical-UV-X-Ray Connection
We present the results of a 2 yr long optical monitoring program of the narrow-line Seyfert 1 galaxy Ark 564. The majority of this monitoring project was also covered by X-ray observations (RXTE),…
Benchmark stars for Gaia Fundamental properties of the Population II star HD 140283 from interferometric, spectroscopic, and photometric data
- O. Creevey, F. Th'evenin, N. Turner
- Physics
- 17 October 2014
Metal-poor halo stars are important astrophysical laboratories that allow us to unravel details about many aspects of astrophysics, including the chemical conditions at the formation of our Galaxy,…
The expanding fireball of Nova Delphini 2013
- G. Schaefer, T. Brummelaar, P. Muirhead
- PhysicsNature
- 13 November 2014
Near-infrared interferometric measurements of the angular size of Nova Delphini 2013 are reported, suggesting a prolate or bipolar structure that develops as early as the second day of the explosion, and a geometric distance to the nova of 4.54 ± 0.59 kiloparsecs from the Sun.
Predicting stellar angular diameters from V, I C , H and K photometry
- A. Adams, T. Boyajian, K. Braun
- Physics, Geology
- 12 September 2017
Determining the physical properties of microlensing events depends on having accurate angular sizes of the source star. Using long-baseline optical interferometry we are able to measure the angular…
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