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HIGH CONTRAST IMAGI...
HIGH CONTRAST IMAGING WITH SPITZER : CONSTRAINING THE FREQUENCY OF GIANT PLANETS OUT TO 1000 au SEPARATIONS
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Durkan, Stephen (author)
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- Janson, Markus (author)
- Stockholms universitet,Institutionen för astronomi
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Carson, Joseph C. (author)
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(creator_code:org_t)
- 2016
- 2016
- English.
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In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 824:1
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
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- We report results of a re-analysis of archival Spitzer IRAC direct imaging surveys encompassing a variety of nearby stars. Our sample is generated from the combined observations of 73 young stars (median age, distance, spectral type = 85 Myr, 23.3 pc, G5) and 48 known exoplanet host stars with unconstrained ages (median distance, spectral type = 22.6 pc, G5). While the small size of Spitzer provides a lower resolution than 8 m class AO-assisted ground-based telescopes, which have been used for constraining the frequency of 0.5-13 M-J planets at separations of 10-10(2) au, its exquisite infrared sensitivity provides the ability to place unmatched constraints on the planetary populations at wider separations. Here we apply sophisticated high-contrast techniques to our sample in order to remove the stellar point-spread function and to open up sensitivity to planetary mass companions down to 5. separations. This enables sensitivity to 0.5-13 M-J planets at physical separations on the order of 10(2)-10(3) au, allowing us to probe a parameter space that has not previously been systematically explored to any similar degree of sensitivity. Based on a color and proper motion analysis, we do not record any planetary detections. Exploiting this enhanced survey sensitivity, employing Monte Carlo simulations with a Bayesian approach, and assuming a mass distribution of dn/dm alpha m(-1.31), we constrain (at 95% confidence) a population of 0.5-13 M-J planets at separations of 100-1000 au with an upper frequency limit of 9%.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- infrared: planetary systems
- planetary systems
- techniques: image processing
Publication and Content Type
- ref (subject category)
- art (subject category)
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