Scaling K2. III. Comparable Planet Occurrence in the FGK Samples of Campaign 5 and Kepler
© 2020. The American Astronomical Society. All rights reserved.. Using our K2 Campaign 5 fully automated planet-detection data set (43 planets), which has corresponding measures of completeness and reliability, we infer an underlying planet population model for the FGK dwarf sample (9257 stars). Imp...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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American Astronomical Society
2021
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| Online Access: | https://hdl.handle.net/1721.1/132441 |
| _version_ | 1826200057440894976 |
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| author | Zink, JK Hardegree-Ullman, KK Christiansen, JL Petigura, EA Dressing, CD Schlieder, JE Ciardi, DR Crossfield, IJM |
| author_facet | Zink, JK Hardegree-Ullman, KK Christiansen, JL Petigura, EA Dressing, CD Schlieder, JE Ciardi, DR Crossfield, IJM |
| author_sort | Zink, JK |
| collection | MIT |
| description | © 2020. The American Astronomical Society. All rights reserved.. Using our K2 Campaign 5 fully automated planet-detection data set (43 planets), which has corresponding measures of completeness and reliability, we infer an underlying planet population model for the FGK dwarf sample (9257 stars). Implementing a broken power law for both the period and radius distributions, we find an overall planet occurrence of planets per star within a period range of 0.5-38 days. Making similar cuts and running a comparable analysis on the Kepler sample (2318 planets; 94,222 stars), we find an overall occurrence of 1.10 0.05 planets per star. Since the Campaign 5 field is nearly 120 angular degrees away from the Kepler field, this occurrence similarity offers evidence that the Kepler sample may provide a good baseline for Galactic inferences. Furthermore, the Kepler stellar sample is metal-rich compared to the K2 Campaign 5 sample, so a finding of occurrence parity may reduce the role of metallicity in planet formation. However, a weak (1.5σ) difference, in agreement with metal-driven formation, is found when assuming the Kepler model power laws for the K2 Campaign 5 sample and optimizing only the planet occurrence factor. This weak trend indicates that further investigation of metallicity-dependent occurrence is warranted once a larger sample of uniformly vetted K2 planet candidates is made available. |
| first_indexed | 2024-09-23T11:30:20Z |
| format | Article |
| id | mit-1721.1/132441 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T11:30:20Z |
| publishDate | 2021 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/1324412021-09-21T03:41:59Z Scaling K2. III. Comparable Planet Occurrence in the FGK Samples of Campaign 5 and Kepler Zink, JK Hardegree-Ullman, KK Christiansen, JL Petigura, EA Dressing, CD Schlieder, JE Ciardi, DR Crossfield, IJM © 2020. The American Astronomical Society. All rights reserved.. Using our K2 Campaign 5 fully automated planet-detection data set (43 planets), which has corresponding measures of completeness and reliability, we infer an underlying planet population model for the FGK dwarf sample (9257 stars). Implementing a broken power law for both the period and radius distributions, we find an overall planet occurrence of planets per star within a period range of 0.5-38 days. Making similar cuts and running a comparable analysis on the Kepler sample (2318 planets; 94,222 stars), we find an overall occurrence of 1.10 0.05 planets per star. Since the Campaign 5 field is nearly 120 angular degrees away from the Kepler field, this occurrence similarity offers evidence that the Kepler sample may provide a good baseline for Galactic inferences. Furthermore, the Kepler stellar sample is metal-rich compared to the K2 Campaign 5 sample, so a finding of occurrence parity may reduce the role of metallicity in planet formation. However, a weak (1.5σ) difference, in agreement with metal-driven formation, is found when assuming the Kepler model power laws for the K2 Campaign 5 sample and optimizing only the planet occurrence factor. This weak trend indicates that further investigation of metallicity-dependent occurrence is warranted once a larger sample of uniformly vetted K2 planet candidates is made available. 2021-09-20T18:22:24Z 2021-09-20T18:22:24Z 2020-10-20T14:18:56Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/132441 en 10.3847/1538-3881/aba123 Astronomical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Astronomical Society The American Astronomical Society |
| spellingShingle | Zink, JK Hardegree-Ullman, KK Christiansen, JL Petigura, EA Dressing, CD Schlieder, JE Ciardi, DR Crossfield, IJM Scaling K2. III. Comparable Planet Occurrence in the FGK Samples of Campaign 5 and Kepler |
| title | Scaling K2. III. Comparable Planet Occurrence in the FGK Samples of Campaign 5 and Kepler |
| title_full | Scaling K2. III. Comparable Planet Occurrence in the FGK Samples of Campaign 5 and Kepler |
| title_fullStr | Scaling K2. III. Comparable Planet Occurrence in the FGK Samples of Campaign 5 and Kepler |
| title_full_unstemmed | Scaling K2. III. Comparable Planet Occurrence in the FGK Samples of Campaign 5 and Kepler |
| title_short | Scaling K2. III. Comparable Planet Occurrence in the FGK Samples of Campaign 5 and Kepler |
| title_sort | scaling k2 iii comparable planet occurrence in the fgk samples of campaign 5 and kepler |
| url | https://hdl.handle.net/1721.1/132441 |
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