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HIGH CONTRAST IMAGING WITH SPITZER: CONSTRAINING THE FREQUENCY OF GIANT PLANETS OUT TO 1000 au SEPARATIONS
Stockholm University, Faculty of Science, Department of Astronomy.
Number of Authors: 32016 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 824, no 1, article id 58Article in journal (Refereed) Published
Abstract [en]

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%.

Place, publisher, year, edition, pages
2016. Vol. 824, no 1, article id 58
Keywords [en]
infrared: planetary systems, planetary systems, techniques: image processing
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-168075DOI: 10.3847/0004-637X/824/1/58ISI: 000377937300058OAI: oai:DiVA.org:su-168075DiVA, id: diva2:1315012
Available from: 2019-05-10 Created: 2019-05-10 Last updated: 2019-05-10Bibliographically approved

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