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The HOSTS Survey for Exozodiacal Dust: Observational Results from the Complete Survey
- Source :
- The Astronomical Journal, The Astronomical Journal, American Astronomical Society, 2020, 159 (4), pp.177. ⟨10.3847/1538-3881/ab7817⟩
- Publication Year :
- 2020
- Publisher :
- IOP PUBLISHING LTD, 2020.
-
Abstract
- The Large Binocular Telescope Interferometer (LBTI) enables nulling interferometric observations across the N band (8 to 13 um) to suppress a star's bright light and probe for faint circumstellar emission. We present and statistically analyze the results from the LBTI/HOSTS (Hunt for Observable Signatures of Terrestrial Systems) survey for exozodiacal dust. By comparing our measurements to model predictions based on the Solar zodiacal dust in the N band, we estimate a 1 sigma median sensitivity of 23 zodis for early type stars and 48 zodis for Sun-like stars, where 1 zodi is the surface density of habitable zone (HZ) dust in the Solar system. Of the 38 stars observed, 10 show significant excess. A clear correlation of our detections with the presence of cold dust in the systems was found, but none with the stellar spectral type or age. The majority of Sun-like stars have relatively low HZ dust levels (best-fit median: 3 zodis, 1 sigma upper limit: 9 zodis, 95% confidence: 27 zodis based on our N band measurements), while ~20% are significantly more dusty. The Solar system's HZ dust content is consistent with being typical. Our median HZ dust level would not be a major limitation to the direct imaging search for Earth-like exoplanets, but more precise constraints are still required, in particular to evaluate the impact of exozodiacal dust for the spectroscopic characterization of imaged exo-Earth candidates.<br />Comment: accepted for publication in AJ
- Subjects :
- Solar System
010504 meteorology & atmospheric sciences
FOS: Physical sciences
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Astronomy & Astrophysics
01 natural sciences
EXO-ZODI
CALIBRATOR STARS
MEAN-MOTION RESONANCES
0103 physical sciences
CIRCUMSTELLAR MATERIAL
Astrophysics::Solar and Stellar Astrophysics
INNER
010303 astronomy & astrophysics
Habitable planets
Solar and Stellar Astrophysics (astro-ph.SR)
Astrophysics::Galaxy Astrophysics
QB
0105 earth and related environmental sciences
[PHYS]Physics [physics]
Earth and Planetary Astrophysics (astro-ph.EP)
Physics
Zodiacal light
Science & Technology
Habitable zone
DEBRIS DISKS
ORIGIN
Astrophysics::Instrumentation and Methods for Astrophysics
Astronomy and Astrophysics
Large Binocular Telescope
Observable
Exozodiacal dust
Exoplanet
EVOLUTION
P-R DRAG
Interferometry
Stars
Astrophysics - Solar and Stellar Astrophysics
13. Climate action
Space and Planetary Science
Physical Sciences
Astrophysics::Earth and Planetary Astrophysics
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Circumstellar habitable zone
MAIN-SEQUENCE STARS
Astrophysics - Earth and Planetary Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 00046256 and 15383881
- Database :
- OpenAIRE
- Journal :
- The Astronomical Journal, The Astronomical Journal, American Astronomical Society, 2020, 159 (4), pp.177. ⟨10.3847/1538-3881/ab7817⟩
- Accession number :
- edsair.doi.dedup.....0a5717930a8cea8cbcb7e896a82b4394