Harnessing the Potential of Radial Velocity Exoplanet Surveys- [electronic resource]
Harnessing the Potential of Radial Velocity Exoplanet Surveys- [electronic resource]
- Material Type
- 단행본
- 0016935408
- Date and Time of Latest Transaction
- 20240214101928
- ISBN
- 9798380730730
- DDC
- 500
- Author
- Gupta, Arvind F.
- Title/Author
- Harnessing the Potential of Radial Velocity Exoplanet Surveys - [electronic resource]
- Publish Info
- [S.l.]: : The Pennsylvania State University., 2023
- Publish Info
- Ann Arbor : : ProQuest Dissertations & Theses,, 2023
- Material Info
- 1 online resource(188 p.)
- General Note
- Source: Dissertations Abstracts International, Volume: 85-05, Section: B.
- General Note
- Advisor: Wright, Jason T.
- 학위논문주기
- Thesis (Ph.D.)--The Pennsylvania State University, 2023.
- Restrictions on Access Note
- This item must not be sold to any third party vendors.
- Abstracts/Etc
- 요약Dedicated exoplanet surveys which combine generous time allocations with the cutting-edge precisions afforded by current extreme precision radial velocity (EPRV) spectrographs have placed a longstanding goal within reach: the first detection of an Earth analog exoplanet. But survey success will depend critically on our capacity to enact optimized observing strategies and mitigate known sources of noise to extract the weak signals induced by the exoplanets we seek. Here, I discuss steps that I have taken to address this challenge through work with NEID, a new spectrograph on the WIYN 3.5m telescope at Kitt Peak National Observatory, and with a novel approach to EPRV exoplanet survey analysis.First, I describe the NEID Earth Twin Survey (NETS), a 5-year RV exoplanet survey being conducted with the NEID spectrograph. In addition to discussing the goals and constraints of the survey and outlining our top level observing strategy, I break down the various sources of external noise that will degrade the achieved precision relative to the instrumental floor. I then formulate a target prioritization metric with which I identify the sample of nearby, Sun-like stars that is most conducive to RV exoplanet detection.Next, I describe the design of the graphical user interfaces (GUIs) with which NEID spectrograph operations are conducted. These GUIs are integrated into the NEID instrument control system and facilitate seamless communication with spectrograph subsystems and enable automatic spectrograph configuration and target ingestion from the nightly observing queue, which improves operational efficiency and consistency across epochs. By interfacing with the NEID exposure meter, the GUIs also allow observers to monitor the progress of individual exposures and trigger the shutter on user-defined SNR thresholds, ensuring the collection of high precision data and minimizing noise contributions from detector charge transfer inefficiency.I then discuss the detection and analysis of p-mode oscillation signals in the subgiant star HD 35833 with both NEID and TESS. These results validate models for the correlated noise impact of oscillations on RV observations and strategies for mitigating this noise contribution. While the signal is detected in both RVs and photometry, the observed RV amplitudes are suppressed significantly relative to expectations. I discuss possible causes of this discrepancy and comment on implications for RV exoplanet observations. I also present an update model for predicting the residual RV oscillation amplitudes for sequences of exposures separated by nonzero readout time.Acknowledging the obstacles presented by oscillations and other correlated noise contributions from stellar variability, I outline a new EPRV survey simulation and analysis framework, in which the Fisher information content of a survey is used to determine exoplanet detection limits. I use this framework to assess the efficacy of common observing strategies and to identify those that will optimize detection of Earth analog exoplanets under various assumptions about stellar variability signals.Finally, I present a detailed analysis of the first two years of NETS observations. I outline various diagnostic measures of the survey performance to date and I identify and discuss several RV signals detected in our data set, including a new exoplanet orbiting the nearby Sun-like star HD 86728. This is the first exoplanet discovered with NETS, and it showcases the state-of-the-art precision NEID is able to deliver. I conclude with a discussion of how the work presented herein will inform the design of future EPRV exoplanet surveys.
- Subject Added Entry-Topical Term
- Decomposition.
- Subject Added Entry-Topical Term
- Time series.
- Subject Added Entry-Topical Term
- Earth.
- Subject Added Entry-Topical Term
- Astrophysics.
- Subject Added Entry-Topical Term
- Astronomy.
- Index Term-Uncontrolled
- Time allocations
- Index Term-Uncontrolled
- Spectrograph
- Index Term-Uncontrolled
- Harnessing
- Index Term-Uncontrolled
- Earth analog exoplanet
- Added Entry-Corporate Name
- The Pennsylvania State University.
- Host Item Entry
- Dissertations Abstracts International. 85-05B.
- Host Item Entry
- Dissertation Abstract International
- Electronic Location and Access
- 로그인 후 원문을 볼 수 있습니다.
- 소장사항
-
202402 2024
Detail Info.
- Reservation
- Not Exist
- My Folder
- First Request
- 비도서대출신청
- 야간 도서대출신청
로그인 후 이용 가능합니다.