{
  "id": "1602.00638",
  "version": "v1",
  "published": "2016-02-01T18:54:56.000Z",
  "updated": "2016-02-01T18:54:56.000Z",
  "title": "The K2-ESPRINT Project IV: A Hot Jupiter in a Prograde Orbit with a Possible Stellar Companion",
  "authors": [
    "Teruyuki Hirano",
    "Grzegorz Nowak",
    "Masayuki Kuzuhara",
    "Enric Palle",
    "Fei Dai",
    "Liang Yu",
    "Vincent Van Eylen",
    "Yoichi Takeda",
    "Timothy D. Brandt",
    "Norio Narita",
    "Sergio Velasco",
    "Jorge Prieto Arranz",
    "Roberto Sanchis-Ojeda",
    "Joshua N. Winn",
    "Tomoyuki Kudo",
    "Nobuhiko Kusakabe",
    "Akihiko Fukui",
    "Bun'ei Sato",
    "Simon Albrecht",
    "Ignasi Ribas",
    "Tsuguru Ryu",
    "Motohide Tamura"
  ],
  "comment": "8 pages, 7 figures, Submitted to ApJ",
  "categories": [
    "astro-ph.EP",
    "astro-ph.SR"
  ],
  "abstract": "We report on the detection and early characterization of a hot Jupiter in a 3-day orbit around EPIC 212110888, a metal-rich F-type star located in the K2 Cycle 5 field. Our follow-up campaign involves precise radial velocity (RV) measurements and high-contrast imaging using multiple facilities. The absence of a bright nearby source in our high-contrast data suggests that the transit-like signals are not due to light variations from such a contaminant star. Our intensive RV measurements show that EPIC 212110888b has a mass of $1.726\\pm0.085M_J$, confirming its status as a planet. We also detect the Rossiter-McLaughlin effect for EPIC 212110888b and show that the system has a good spin-orbit alignment ($\\lambda=4_{-10}^{+11}$ degrees). High-contrast images obtained by the HiCIAO camera on the Subaru 8.2-m telescope reveal a faint companion candidate ($\\Delta m_H=6.19\\pm 0.11$) at a separation of $\\sim 0\\farcs36$. Follow-up observations are needed to confirm that the companion candidate is physically associated with EPIC 212110888. EPIC 212110888b appears to be an example of a typical ``hot Jupiter,' albeit one which can be precisely characterized using a combination of K2 photometry and ground-based follow-up.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-02-01T18:54:56.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "hot jupiter",
      "stellar companion",
      "prograde orbit",
      "k2-esprint project",
      "epic 212110888b appears"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2016arXiv160200638H"
    }
  }
}