Detection of Nine M8.0-L0.5 Binaries: The Very Low Mass Binary Population and Its Implications for Brown Dwarf and Very Low Mass Star Formation
- L. Close, N. Siegler, M. Freed, B. Biller
- Physics, Geology
- 6 January 2003
Use of the highly sensitive Hokupa'a/Gemini curvature wave front sensor has allowed direct adaptive optics (AO) guiding on very low mass (VLM) stars with SpT = M8.0-L0.5. A survey of 39 such objects…
Chandra Spectra of the Soft X-Ray Diffuse Background
- M. Markevitch, M. Bautz, S. Wolk
- Physics
- 21 September 2002
We present an exploratory Chandra ACIS-S3 study of the diffuse component of the cosmic X-ray background (CXB) in the 0.3-7 keV band for four directions at high Galactic latitudes, with emphasis on…
A LIKELY CLOSE-IN LOW-MASS STELLAR COMPANION TO THE TRANSITIONAL DISK STAR HD 142527
With the uniquely high contrast within 0.″1 (Δmag(L′) = 5–6.5 mag) available using Sparse Aperture Masking with NACO at Very Large Telescope, we detected asymmetry in the flux from the Herbig Fe star…
THE GEMINI/NICI PLANET-FINDING CAMPAIGN: THE FREQUENCY OF PLANETS AROUND YOUNG MOVING GROUP STARS
- B. Biller, Michael C. Liu, D. Toomey
- Physics, Geology
- 5 September 2013
We report results of a direct imaging survey for giant planets around 80 members of the β Pic, TW Hya, Tucana-Horologium, AB Dor, and Hercules-Lyra moving groups, observed as part of the Gemini/NICI…
A dynamical calibration of the mass–luminosity relation at very low stellar masses and young ages
A dynamical determination of the mass of the newly resolved low-mass companion AB Dor C, whose mass is 0.090 ± 0.005 solar masses, finds that the standard mass–luminosity relations overestimate the near-infrared luminosity of such objects by about a factor of ∼2.5 at young ages.
Stellar companions to exoplanet host stars: Lucky Imaging of transiting planet hosts
- C. Bergfors, W. Brandner, R. Kohler
- Physics, Geology
- 18 September 2012
Observed properties of stars and planets in binary/multiple star systems provide clues to planet formation and evolution. We extended our survey for visual stellar companions to the hosts of…
An Imaging Survey for Extrasolar Planets around 45 Close, Young Stars with the Simultaneous Differential Imager at the Very Large Telescope and MMT
We present the results of a survey of 45 young (≲250 Myr), close (≲50 pc) stars with the Simultaneous Differential Imager (SDI) implemented at the VLT and the MMT for the direct detection of…
DIRECT IMAGING OF A COLD JOVIAN EXOPLANET IN ORBIT AROUND THE SUN-LIKE STAR GJ 504
- M. Kuzuhara, M. Tamura, T. Usuda
- Physics, Geology
- 10 July 2013
Several exoplanets have recently been imaged at wide separations of >10 AU from their parent stars. These span a limited range of ages (<50 Myr) and atmospheric properties, with temperatures of…
THE GEMINI NICI PLANET-FINDING CAMPAIGN: DISCOVERY OF A CLOSE SUBSTELLAR COMPANION TO THE YOUNG DEBRIS DISK STAR PZ Tel
- B. Biller, Michael C. Liu, D. Toomey
- Physics, Geology
- 27 July 2010
We report the discovery of a tight substellar companion to the young solar analog PZ Tel, a member of the β Pic moving group observed with high-contrast adaptive optics imaging as part of the Gemini…
A STATISTICAL ANALYSIS OF SEEDS AND OTHER HIGH-CONTRAST EXOPLANET SURVEYS: MASSIVE PLANETS OR LOW-MASS BROWN DWARFS?
- Timothy D. Brandt, M. McElwain, M. Tamura
- Physics, Geology
- 21 April 2014
We conduct a statistical analysis of a combined sample of direct imaging data, totalling nearly 250 stars. The stars cover a wide range of ages and spectral types, and include five detections (κ And…
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