The Impact of the Convective Blueshift Effect on Spectroscopic Planetary Transits

Details The Impact of the Convective Blueshift Effect on Spectroscopic Planetary Transits The Impact of the Convective Blueshift Effect on Spectroscopic Planetary Transits

2011-03-03

arxiv.org/abs/1103.0775v2

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

v2: replaced with accepted version

Scientific paper

We present here a small anomalous radial velocity (RV) signal expected to be present in RV curves measured during planetary transits. This signal is induced by the convective blueshift (CB) effect --- a net blueshift emanating from the stellar surface, resulting from a larger contribution of rising hot and bright gas relative to the colder and darker sinking gas. Since the CB radial component varies across the stellar surface, the light blocked by the planet during a transit will have a varying RV component, resulting in a small shift of the measured RVs. The CB-induced anomalous RV curve is different than, and independent of, the well known Rossiter-McLaughlin (RM) effect, where the latter is used for determining the sky-projected angle between the host star rotation axis and the planet's orbital angular momentum axis. The observed RV curve is the sum of the CB and RM signals, and they are both superposed on the orbital Keplerian curve. If not accounted for, the presence of the CB RV signal in the spectroscopic transit RV curve may bias the estimate of the spin-orbit angle. In addition, future very high precision RVs will allow the use of transiting planets to study the CB of their host stars.

Affiliated with

Also associated with

No associations

Rating

The Impact of the Convective Blueshift Effect on Spectroscopic Planetary Transits does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Impact of the Convective Blueshift Effect on Spectroscopic Planetary Transits, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Impact of the Convective Blueshift Effect on Spectroscopic Planetary Transits will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-319972