Denise C. Stephens - Space Telescope Science Institute

Denise C. Stephens
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Denise C. Stephens
Space Telescope Science Institute
United States

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Earth and Planetary Astrophysics (5)
Astrophysics (4)
Solar and Stellar Astrophysics (2)

Publications Authored By Denise C. Stephens

We report the discovery of KELT-12b, a highly inflated Jupiter-mass planet transiting a mildly evolved host star. We identified the initial transit signal in the KELT-North survey data and established the planetary nature of the companion through precise follow-up photometry, high-resolution spectroscopy, precise radial velocity measurements, and high-resolution adaptive optics imaging. Our preferred best-fit model indicates that the $V = 10. Read More

During the planet formation process, billions of comets are created and ejected into interstellar space. The detection and characterization of such interstellar comets (also known as extra-solar planetesimals or extra-solar comets) would give us in situ information about the efficiency and properties of planet formation throughout the galaxy. However, no interstellar comets have ever been detected, despite the fact that their hyperbolic orbits would make them readily identifiable as unrelated to the solar system. Read More

We have searched 101 Classical transneptunian objects for companions with the Hubble Space Telescope. Of these, at least 21 are binary. The heliocentric inclinations of the objects we observed range from 0. Read More

We have measured the separations and position angles of the two components of the binary transneptunian object 1997 CQ29 at eight epochs. From these data we are able to constrain the orbit and mass of this binary system. The best fitting orbit has an orbital period of P = 312+/-3 days. Read More

Affiliations: 1Space Telescope Science Institute, 2Joint Astronomy Centre
Category: Astrophysics

L and T dwarfs emit most of their radiation in the near infrared and their spectral energy distributions are dominated by strong molecular absorption bands. These highly structured energy distributions lead to JHK magnitudes that are extremely sensitive to the exact filter bandpass used. In the case of the T dwarfs, the differences between commonly used photometric systems can be as large as 0. Read More

Affiliations: 1Space Telescope Science Institute, 2Space Telescope Science Institute, 3Lowell Observatory, 4Lowell Observatory, 5Lowell Observatory, 6Lowell Observatory, 7Northern Arizona University, 8University of Oklahoma, 9NASA Ames Research Center
Category: Astrophysics

Images of the trans-Neptunian objects 1997 CQ29 and 2000 CF105 obtained with the Hubble Space Telescope's WFPC2 camera show them to be binary. The two components of 1997 CQ29 were separated in our images by 0.20 arcsec in November 2001 and by 0. Read More