CHARACTERIZATION OF THE K2-19 MULTIPLE-TRANSITING PLANETARY SYSTEM VIA HIGH-DISPERSION SPECTROSCOPY, AO IMAGING, AND TRANSIT TIMING VARIATIONS
K2-19 (EPIC201505350) is an interesting planetary system in which two transiting planets with radii ~7 R[subscript ⊕] (inner planet b) and ~4 R[subscript ⊕] (outer planet c) have orbits that are nearly in a 3:2 mean-motion resonance. Here, we present results of ground-based follow-up observations fo...
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2016
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| Online Access: | http://hdl.handle.net/1721.1/101664 https://orcid.org/0000-0002-4265-047X |
| _version_ | 1826217241161498624 |
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| author | Narita, Norio Hirano, Teruyuki Fukui, Akihiko Hori, Yasunori Sanchis-Ojeda, Roberto Ryu, Tsuguru Kusakabe, Nobuhiko Kudo, Tomoyuki Onitsuka, Masahiro Delrez, Laetitia Gillon, Michael Jehin, Emmanuel McCormac, James Holman, Matthew Izumiura, Hideyuki Takeda, Yoichi Tamura, Motohide Yanagisawa, Kenshi Winn, Joshua Nathan |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Narita, Norio Hirano, Teruyuki Fukui, Akihiko Hori, Yasunori Sanchis-Ojeda, Roberto Ryu, Tsuguru Kusakabe, Nobuhiko Kudo, Tomoyuki Onitsuka, Masahiro Delrez, Laetitia Gillon, Michael Jehin, Emmanuel McCormac, James Holman, Matthew Izumiura, Hideyuki Takeda, Yoichi Tamura, Motohide Yanagisawa, Kenshi Winn, Joshua Nathan |
| author_sort | Narita, Norio |
| collection | MIT |
| description | K2-19 (EPIC201505350) is an interesting planetary system in which two transiting planets with radii ~7 R[subscript ⊕] (inner planet b) and ~4 R[subscript ⊕] (outer planet c) have orbits that are nearly in a 3:2 mean-motion resonance. Here, we present results of ground-based follow-up observations for the K2-19 planetary system. We have performed high-dispersion spectroscopy and high-contrast adaptive-optics imaging of the host star with the HDS and HiCIAO on the Subaru 8.2 m telescope. We find that the host star is a relatively old (≥8 Gyr) late G-type star (T[subscript eff] ~ 5350 K, M[subscript s] ~ 0.9 M[subscript ⊙], and R[subscript s] ~ 0.9 R[subscript ⊙]). We do not find any contaminating faint objects near the host star that could be responsible for (or dilute) the transit signals. We have also conducted transit follow-up photometry for the inner planet with KeplerCam on the FLWO 1.2 m telescope, TRAPPISTCAM on the TRAPPIST 0.6 m telescope, and MuSCAT on the OAO 1.88 m telescope. We confirm the presence of transit timing variations (TTVs), as previously reported by Armstrong and coworkers. We model the observed TTVs of the inner planet using the synodic chopping formulae given by Deck & Agol. We find two statistically indistinguishable solutions for which the period ratios (P[subscript c]/P[subscript b]) are located slightly above and below the exact 3:2 commensurability. Despite the degeneracy, we derive the orbital period of the inner planet P[subscript b] ~ 7.921 days and the mass of the outer planet M[subscript c] ~ 20 M[subscript ⊕]. Additional transit photometry (especially for the outer planet) as well as precise radial-velocity measurements would be helpful to break the degeneracy and to determine the mass of the inner planet. |
| first_indexed | 2024-09-23T17:00:13Z |
| format | Article |
| id | mit-1721.1/101664 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T17:00:13Z |
| publishDate | 2016 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1016642022-10-03T09:45:12Z CHARACTERIZATION OF THE K2-19 MULTIPLE-TRANSITING PLANETARY SYSTEM VIA HIGH-DISPERSION SPECTROSCOPY, AO IMAGING, AND TRANSIT TIMING VARIATIONS Narita, Norio Hirano, Teruyuki Fukui, Akihiko Hori, Yasunori Sanchis-Ojeda, Roberto Ryu, Tsuguru Kusakabe, Nobuhiko Kudo, Tomoyuki Onitsuka, Masahiro Delrez, Laetitia Gillon, Michael Jehin, Emmanuel McCormac, James Holman, Matthew Izumiura, Hideyuki Takeda, Yoichi Tamura, Motohide Yanagisawa, Kenshi Winn, Joshua Nathan Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Winn, Joshua Nathan K2-19 (EPIC201505350) is an interesting planetary system in which two transiting planets with radii ~7 R[subscript ⊕] (inner planet b) and ~4 R[subscript ⊕] (outer planet c) have orbits that are nearly in a 3:2 mean-motion resonance. Here, we present results of ground-based follow-up observations for the K2-19 planetary system. We have performed high-dispersion spectroscopy and high-contrast adaptive-optics imaging of the host star with the HDS and HiCIAO on the Subaru 8.2 m telescope. We find that the host star is a relatively old (≥8 Gyr) late G-type star (T[subscript eff] ~ 5350 K, M[subscript s] ~ 0.9 M[subscript ⊙], and R[subscript s] ~ 0.9 R[subscript ⊙]). We do not find any contaminating faint objects near the host star that could be responsible for (or dilute) the transit signals. We have also conducted transit follow-up photometry for the inner planet with KeplerCam on the FLWO 1.2 m telescope, TRAPPISTCAM on the TRAPPIST 0.6 m telescope, and MuSCAT on the OAO 1.88 m telescope. We confirm the presence of transit timing variations (TTVs), as previously reported by Armstrong and coworkers. We model the observed TTVs of the inner planet using the synodic chopping formulae given by Deck & Agol. We find two statistically indistinguishable solutions for which the period ratios (P[subscript c]/P[subscript b]) are located slightly above and below the exact 3:2 commensurability. Despite the degeneracy, we derive the orbital period of the inner planet P[subscript b] ~ 7.921 days and the mass of the outer planet M[subscript c] ~ 20 M[subscript ⊕]. Additional transit photometry (especially for the outer planet) as well as precise radial-velocity measurements would be helpful to break the degeneracy and to determine the mass of the inner planet. 2016-03-10T15:37:08Z 2016-03-10T15:37:08Z 2015-12 2015-09 Article http://purl.org/eprint/type/JournalArticle 1538-4357 0004-637X http://hdl.handle.net/1721.1/101664 Narita, Norio, Teruyuki Hirano, Akihiko Fukui, Yasunori Hori, Roberto Sanchis-Ojeda, Joshua N. Winn, Tsuguru Ryu, et al. “CHARACTERIZATION OF THE K2-19 MULTIPLE-TRANSITING PLANETARY SYSTEM VIA HIGH-DISPERSION SPECTROSCOPY, AO IMAGING, AND TRANSIT TIMING VARIATIONS.” The Astrophysical Journal 815, no. 1 (December 8, 2015): 47. © 2015 The American Astronomical Society https://orcid.org/0000-0002-4265-047X en_US http://dx.doi.org/10.1088/0004-637x/815/1/47 The Astrophysical 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 IOP Publishing IOP Publishing |
| spellingShingle | Narita, Norio Hirano, Teruyuki Fukui, Akihiko Hori, Yasunori Sanchis-Ojeda, Roberto Ryu, Tsuguru Kusakabe, Nobuhiko Kudo, Tomoyuki Onitsuka, Masahiro Delrez, Laetitia Gillon, Michael Jehin, Emmanuel McCormac, James Holman, Matthew Izumiura, Hideyuki Takeda, Yoichi Tamura, Motohide Yanagisawa, Kenshi Winn, Joshua Nathan CHARACTERIZATION OF THE K2-19 MULTIPLE-TRANSITING PLANETARY SYSTEM VIA HIGH-DISPERSION SPECTROSCOPY, AO IMAGING, AND TRANSIT TIMING VARIATIONS |
| title | CHARACTERIZATION OF THE K2-19 MULTIPLE-TRANSITING PLANETARY SYSTEM VIA HIGH-DISPERSION SPECTROSCOPY, AO IMAGING, AND TRANSIT TIMING VARIATIONS |
| title_full | CHARACTERIZATION OF THE K2-19 MULTIPLE-TRANSITING PLANETARY SYSTEM VIA HIGH-DISPERSION SPECTROSCOPY, AO IMAGING, AND TRANSIT TIMING VARIATIONS |
| title_fullStr | CHARACTERIZATION OF THE K2-19 MULTIPLE-TRANSITING PLANETARY SYSTEM VIA HIGH-DISPERSION SPECTROSCOPY, AO IMAGING, AND TRANSIT TIMING VARIATIONS |
| title_full_unstemmed | CHARACTERIZATION OF THE K2-19 MULTIPLE-TRANSITING PLANETARY SYSTEM VIA HIGH-DISPERSION SPECTROSCOPY, AO IMAGING, AND TRANSIT TIMING VARIATIONS |
| title_short | CHARACTERIZATION OF THE K2-19 MULTIPLE-TRANSITING PLANETARY SYSTEM VIA HIGH-DISPERSION SPECTROSCOPY, AO IMAGING, AND TRANSIT TIMING VARIATIONS |
| title_sort | characterization of the k2 19 multiple transiting planetary system via high dispersion spectroscopy ao imaging and transit timing variations |
| url | http://hdl.handle.net/1721.1/101664 https://orcid.org/0000-0002-4265-047X |
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