서브메뉴
검색
Precision Radial Velocities and Photometry in Pursuit of Exoplanets Around Low-Mass Stars
Precision Radial Velocities and Photometry in Pursuit of Exoplanets Around Low-Mass Stars
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211153003
- ISBN
- 9798346379652
- DDC
- 522.1
- 저자명
- Lin, Andrea S.J.
- 서명/저자
- Precision Radial Velocities and Photometry in Pursuit of Exoplanets Around Low-Mass Stars
- 발행사항
- [Sl] : The Pennsylvania State University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 231 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-05, Section: B.
- 주기사항
- Advisor: Mahadevan, Suvrath.
- 학위논문주기
- Thesis (Ph.D.)--The Pennsylvania State University, 2024.
- 초록/해제
- 요약The radial velocity (RV) technique is one of the core methods of exoplanet detection and characterization. Over the past thirty years, RVs have been extremely fruitful for determining masses of exoplanets, and have become even more prolific since the advent of large-scale transit surveys, since the transit geometry eliminates the M sin idegeneracy, allowing both planetary mass and radius to be determined unambiguously. A true "Earth-twin"-an Earth-radius, Earth-mass planet orbiting a Sun-like (G2V) star at a distance of ∼1 au-is still beyond the grasp of the current generation of RV instruments and near the limits of precision space-based photometry, but low-mass stars (K- and M-dwarfs) offer larger RV and transit signals, making them prime targets for exoplanet discovery while the next generation of instrumentation is under development.In this dissertation I will discuss my contributions to the design and construction of the recent generation of extreme-precision radial velocity (EPRV) spectrographs, followed by my various efforts to use these EPRV instruments, often in conjunction with precision transit photometry, to search for and characterize a diverse variety of planets around low-mass stars.First, I discuss the construction, testing, and integration of the fiber-optic feed of NEID, the new ultra-stabilized red-optical EPRV spectrograph on the WIYN 3.5m Telescope at Kitt Peak National Observatory. I also present the design and implementation of the NEID solar feed, which provides densely-sampled RVs of the Sun "as a star" intended for investigation of instrumental systematics and stellar activity mitigation techniques in order to push toward the level of 10 cm/s RV precision necessary to detect an Earth-twin exoplanet. I was one of the key personnel on the NEID instrument team responsible for the fiber feed, as well as the project lead for the NEID solar feed subsystem.I then present my ongoing blind RV survey, SNEAK-the Search for Nearby Exoplanets Around K-dwarfs-which uses NEID to look for super-Earths (M ≲ 10 M⊕Earth) around mid/late K-dwarfs. I discuss the motivation behind this narrowly-targeted survey and the survey target selection, and include a preliminary analysis of the first two years of SNEAK data. SNEAK and similar efforts leverage our current instrumentation to help maximize scientific return from next-generation facilities like the Extremely Large Telescopes and the Habitable Worlds Observatory.I also discuss several results illustrating the ample diversity of exoplanets around M-dwarfs, which are based upon RV data from NEID and the near-infrared (NIR) Habitable-zone Planet Finder (HPF) as well as both space- and ground-based transit photometry. These efforts include further characterization of TOI-1899b, the only known transiting Warm Jupiter orbiting an M-dwarf; the discovery of TOI-2120b, a radius-gap planet around a mid-M dwarf sitting at the intersection of water-rich and gaseous planets; and confirmation of the radius of LTT 1445Ac, the closest transiting Earth-sized planet (orbiting the mid-M dwarf LTT 1445A), a feat demonstrating the capabilities of precision ground-based photometry.Finally, I conclude by summarizing my work and placing it into the greater context of the immense diversity of planets around low-mass stars, and I outline my plans for future efforts in both instrumentation and exoplanet science to work toward the detection and characterization of Earth-like and eventually, Earth-twin, exoplanets.
- 일반주제명
- Telescopes
- 일반주제명
- Iodine
- 일반주제명
- Electrostatic discharges
- 일반주제명
- Optics
- 기본자료저록
- Dissertations Abstracts International. 86-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008250123s2024 us c eng d■001000017164444
■00520250211153003
■006m o d
■007cr#unu||||||||
■020 ▼a9798346379652
■035 ▼a(MiAaPQ)AAI31631339
■035 ▼a(MiAaPQ)PennState22042apl5194
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a522.1
■1001 ▼aLin, Andrea S.J.
■24510▼aPrecision Radial Velocities and Photometry in Pursuit of Exoplanets Around Low-Mass Stars
■260 ▼a[Sl]▼bThe Pennsylvania State University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a231 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-05, Section: B.
■500 ▼aAdvisor: Mahadevan, Suvrath.
■5021 ▼aThesis (Ph.D.)--The Pennsylvania State University, 2024.
■520 ▼aThe radial velocity (RV) technique is one of the core methods of exoplanet detection and characterization. Over the past thirty years, RVs have been extremely fruitful for determining masses of exoplanets, and have become even more prolific since the advent of large-scale transit surveys, since the transit geometry eliminates the M sin idegeneracy, allowing both planetary mass and radius to be determined unambiguously. A true "Earth-twin"-an Earth-radius, Earth-mass planet orbiting a Sun-like (G2V) star at a distance of ∼1 au-is still beyond the grasp of the current generation of RV instruments and near the limits of precision space-based photometry, but low-mass stars (K- and M-dwarfs) offer larger RV and transit signals, making them prime targets for exoplanet discovery while the next generation of instrumentation is under development.In this dissertation I will discuss my contributions to the design and construction of the recent generation of extreme-precision radial velocity (EPRV) spectrographs, followed by my various efforts to use these EPRV instruments, often in conjunction with precision transit photometry, to search for and characterize a diverse variety of planets around low-mass stars.First, I discuss the construction, testing, and integration of the fiber-optic feed of NEID, the new ultra-stabilized red-optical EPRV spectrograph on the WIYN 3.5m Telescope at Kitt Peak National Observatory. I also present the design and implementation of the NEID solar feed, which provides densely-sampled RVs of the Sun "as a star" intended for investigation of instrumental systematics and stellar activity mitigation techniques in order to push toward the level of 10 cm/s RV precision necessary to detect an Earth-twin exoplanet. I was one of the key personnel on the NEID instrument team responsible for the fiber feed, as well as the project lead for the NEID solar feed subsystem.I then present my ongoing blind RV survey, SNEAK-the Search for Nearby Exoplanets Around K-dwarfs-which uses NEID to look for super-Earths (M ≲ 10 M⊕Earth) around mid/late K-dwarfs. I discuss the motivation behind this narrowly-targeted survey and the survey target selection, and include a preliminary analysis of the first two years of SNEAK data. SNEAK and similar efforts leverage our current instrumentation to help maximize scientific return from next-generation facilities like the Extremely Large Telescopes and the Habitable Worlds Observatory.I also discuss several results illustrating the ample diversity of exoplanets around M-dwarfs, which are based upon RV data from NEID and the near-infrared (NIR) Habitable-zone Planet Finder (HPF) as well as both space- and ground-based transit photometry. These efforts include further characterization of TOI-1899b, the only known transiting Warm Jupiter orbiting an M-dwarf; the discovery of TOI-2120b, a radius-gap planet around a mid-M dwarf sitting at the intersection of water-rich and gaseous planets; and confirmation of the radius of LTT 1445Ac, the closest transiting Earth-sized planet (orbiting the mid-M dwarf LTT 1445A), a feat demonstrating the capabilities of precision ground-based photometry.Finally, I conclude by summarizing my work and placing it into the greater context of the immense diversity of planets around low-mass stars, and I outline my plans for future efforts in both instrumentation and exoplanet science to work toward the detection and characterization of Earth-like and eventually, Earth-twin, exoplanets.
■590 ▼aSchool code: 0176.
■650 4▼aTelescopes
■650 4▼aIodine
■650 4▼aElectrostatic discharges
■650 4▼aOptics
■690 ▼a0752
■71020▼aThe Pennsylvania State University.
■7730 ▼tDissertations Abstracts International▼g86-05B.
■790 ▼a0176
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17164444▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
