Starspots and exoplanets

The discovery of exoplanets has resulted from a significant increase in the precision of stellar radial velocity measurements. In the past decade this precision has improved from several hundreds of ms–1 to a few ms–1. In the near future astrometric measurements will make a similar increase in their...

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Bibliographic Details
Published inAstronomische Nachrichten Vol. 323; no. 3-4; pp. 392 - 394
Main Author Hatzes, A.P.
Format Journal Article
LanguageEnglish
Published Berlin WILEY-VCH Verlag 01.08.2002
WILEY‐VCH Verlag
Subjects
Extrasolar planets
Photometry
planets and satellites: general
Radial velocity
Rotating
Space telescopes
Spots
Stars
Starspots
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Summary:The discovery of exoplanets has resulted from a significant increase in the precision of stellar radial velocity measurements. In the past decade this precision has improved from several hundreds of ms–1 to a few ms–1. In the near future astrometric measurements will make a similar increase in their precision by factors of several hundred. Although discovering exoplanets is driving the need for these precise measurements, these can also be used to study starspots on Sunlike stars. The largest sunspots can produce a radial velocity variation of several ms–1 and an astrometric signal of order tens of micro‐arcseconds in a nearby solar‐type star. The latter is well above the measurement precision of 4 micro‐arcsecs provided by the Space Interferometry Mission (SIM). A combination of precise photometric, radial velocity, and astrometric measurements may enable us to derive spot distributions on slowly rotating late‐type stars with solar‐like levels of activity.
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ISSN:0004-6337
1521-3994
DOI:10.1002/1521-3994(200208)323:3/4<392::AID-ASNA392>3.0.CO;2-M