Exoplanet search with astrometry

We present a review of the interplay between the evolution of circumstellar disks and the formation of planets, both from the perspective of theoretical models and dedicated observations. Based on this, we identify and discuss fundamental questions concerning the formation and evolution of circumstellar disks and planets which can be addressed in the near future with optical and infrared long-baseline interferometers. Furthermore, the importance of complementary observations with long-baseline (sub)millimeter interferometers and high-sensitivity infrared observatories is outlined.

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“…It results from the joint effort of ESO and the ESPRI 16 (Launhardt, 2009). It will offer the following new observing functionalities:…”

Section: Vlti/primamentioning

confidence: 99%

“…The further away from the star, the stronger the astrometric signal (with a longer period to sample). As presented by Launhardt (2009) PRIMA can be used to address several issues:…”

Section: Astrometric Detection Of Exoplanetsmentioning

confidence: 99%

Circumstellar disks and planets

Wolf

Malbet

Alexander

et al. 2012

Astron Astrophys Rev

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“…Exoplanets Simon Albrecht [22], this method will likely deliver new planet detection around relatively nearby stars and will remove the ambiguity in the planetary mass of a number of already detected systems.…”

Section: Pos(bash11)002mentioning

confidence: 99%

Exoplanets

Albrecht¹

2012

Proceedings of Frank N. Bash Symposium 2011: New Horizons in Astronomy — PoS(Bash11)

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In this paper I will discuss the current knowledge we have on planets orbiting other stars than our sun: exoplanets. Our ability to learn about exoplanets depends on the method we choose to search for them. Therefore I will give a short overview of the different detection techniques that are used to find planets. Special emphasis is placed on two techniques, radial velocity search and transit search. I will also focus on a long standing riddle of the field: The occurrence of gas giant planets on orbits with periods of only a few days (Hot-Jupiters). These planets are similar to Jupiter but orbit their stars much closer than even Mercury orbits our own sun. The detection of these Hot-Jupiters was a surprise, as it is thought that they cannot form so close to their stars. Recent measurements of the Rossiter-McLaughlin effect helped to shed light on the formation and evolution of these systems. Finally I will highlight some exciting new developments and recent detections of exoplanets in extreme environments.

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“…In fact, the accuracy of the interferometric differential astrometric measurement is clearly increased if the angular separation between the target and the calibrator is smaller. This is related to the isopistonic angle, an interferometric parameter somewhat similar to the isoplanetary angle in adaptive optics (Launhardt 2009). Calibrators as close as possible to their targets will therefore be preferred.…”

Section: Calibrators and Exoplanet Searchmentioning

confidence: 99%

“…For calibrators the closest is the best, because instruments like dual‐beam PRIMA are expected to gain accuracy if the optical path difference between the two beams is minimal. According to Launhardt (2009), the best angular resolution of PRIMA (≲20 μas) will be only attained with calibrators within ≲ 10–20 arcsec from the science star. Even if there are fewer calibrators within this radius, many are still found.…”

Section: The Cataloguementioning

confidence: 99%