Non-detection of He I in the Atmosphere of GJ 1214b with Keck/NIRSPEC, at a Time of Minimal Telluric Contamination
| العنوان: | Non-detection of He I in the Atmosphere of GJ 1214b with Keck/NIRSPEC, at a Time of Minimal Telluric Contamination |
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| المؤلفون: | Jessica J. Spake, A. Oklopčić, L. A. Hillenbrand, Heather A. Knutson, David Kasper, Fei Dai, Jaume Orell-Miquel, Shreyas Vissapragada, Michael Zhang, Jacob L. Bean |
| المساهمون: | Low Energy Astrophysics (API, FNWI) |
| المصدر: | Astrophysical Journal Letters, 939(1):L11. IOP Publishing Ltd. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Earth and Planetary Astrophysics (astro-ph.EP), Space and Planetary Science, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | Observations of helium in exoplanet atmospheres may reveal the presence of large gaseous envelopes, and indicate ongoing atmospheric escape. Orell-Miquel et al. (2022) used CARMENES to measure a tentative detection of helium for the sub-Neptune GJ 1214b, with a peak excess absorption reaching over 2% in transit depth at 10830 Angstroms. However, several non-detections of helium had previously been reported for GJ 1214b. One explanation for the discrepancy was contamination of the planetary signal by overlapping telluric absorption- and emission lines. We used Keck/NIRSPEC to observe another transit of GJ 1214b at 10830 Angstroms, at a time of minimal contamination by telluric lines, and did not observe planetary helium absorption. Accounting for correlated noise in our measurement, we place an upper limit on the excess absorption size of 1.22% (95% confidence). We find that the discrepancy between the CARMENES and NIRSPEC observations is unlikely to be caused by using different instruments or stellar activity. It is currently unclear whether the difference is due to correlated noise in the observations, or variability in the planetary atmosphere. Accepted for publication in ApJL |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 2041-8205 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c5414553dfd2cc083676ec4734855733Test https://dare.uva.nl/personal/pure/en/publications/nondetection-of-he-i-in-the-atmosphere-of-gj-1214b-with-kecknirspec-at-a-time-of-minimal-telluric-contaminationTest(2145c828-5ee1-4f68-9fdd-0e7f29fcd32f).html |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....c5414553dfd2cc083676ec4734855733 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20418205 |
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