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TW Hydrae: evidence of stellar spots instead of a Hot Jupiter
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Context. TW Hya is a classical T Tauri star that shows significant radial-velocity variations in the optical regime. These variations have been attributed to a 10 planet orbiting the star at 0.04 AU.
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Bisector slope and FWHM of the cross-correlation function provide good diagnostics for stellar activity.
“Other parameters such as the span of the bisector slope and the full width at half-maximum (FWHM) of the cross-correlation function were measured as well. They provide good diagnostics for stellar activity (e.g. Queloz et al. 2001; Huélamo et al. 2008).”
From Mass and period limits on the ringed companion transiting the young star J1407 (2015) · cites this paper as Huélamo et al. 2008
Section 3.1 uses the bisector span (BIS) of the cross-correlation function to investigate whether TW Hya’s radial-velocity signal comes from a stellar spot, supporting that diagnostic. The copy does not establish FWHM as an activity diagnostic; Section 3.3 discusses the CCF’s surface, which is a different measurement. Page numbers are unavailable in the indexed passages. (LLM, conf=0.87)
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References 20 · Cited by 233
Research works printed but not linked: 21
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Metadata
- Authors
- Huélamo, N., Figueira, P., Bonfils, X., Santos, N. C., Pepe, F., Gillon, M., Azevedo, R., Barman, T., Fernández, M., di Folco, E., Guenther, E. W., Lovis, C., Melo, C. H. F., Queloz, D., & Udry, S.
- Affiliations
- University of Geneva (CH)
- University of Lisbon (PT)
- Universidade do Porto (PT)
- Lowell Observatory (US)
- Consejo Superior de Investigaciones Científicas (ES)
- Thüringer Landessternwarte Tautenburg (DE)
- European Southern Observatory (DE)
- ORCID
- Venue
- Astronomy & Astrophysics
- Publisher
- EDP Sciences
- Published
- 2008-08-25
- Volume
- 489
- Issue
- 2
- Pages
- L9-L13
- ISSN
- 0004-6361 (ISSN-L)
- 1432-0746
- OpenAlex
- W2136103161
- Cited by
- 233
- References
- 20
- Citations by year
- 2026: 3 · 2025: 16 · 2024: 12 · 2023: 11 · 2022: 9 · 2021: 4 · 2020: 11 · 2019: 5 · 2018: 9 · 2017: 17 · 2016: 26 · 2015: 8 · 2014: 15 · 2013: 13 · 2012: 18
- FWCI
- 10.89
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Astronomy and Astrophysics (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- Springer Link (Chiba Institute of Technology) (submittedVersion)
- HAL (submittedVersion)
- DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion)
- ORBi (University of Liège) (submittedVersion, other-oa)
- arXiv (Cornell University)
- Funders
- Ministerio de Economía y Competitividad
- Fundação para a Ciência e a Tecnologia (SFRH/BD/21502/2005)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
- Physical Sciences › Physics and Astronomy › Instrumentation › Astronomy and Astrophysical Research
- Keywords
- TW Hydrae, T Tauri stars, stellar spots, hot Jupiters, radial velocity variations, planetary companions, young stellar systems, stellar activity
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