Nulling interferometry: impact of exozodiacal clouds on the performance of future life-finding space missions

Details Nulling interferometry: impact of exozodiacal clouds on the performance of future life-finding space missions Nulling interferometry: impact of exozodiacal clouds on the performance of future life-finding space missions

2009-10-19

arxiv.org/abs/0910.3486v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

17 pages, accepted for publication in A&A

Scientific paper

10.1051/0004-6361/200912973

Earth-sized planets around nearby stars are being detected for the first time by ground-based radial velocity and space-based transit surveys. This milestone is opening the path towards the definition of missions able to directly detect the light from these planets, with the identification of bio-signatures as one of the main objectives. In that respect, both ESA and NASA have identified nulling interferometry as one of the most promising techniques. The ability to study distant planets will however depend on exozodiacal dust clouds surrounding the target stars. In this paper, we assess the impact of exozodiacal dust clouds on the performance of an infrared nulling interferometer in the Emma X-array configuration. For the nominal mission architecture with 2-m aperture telescopes, we found that point-symmetric exozodiacal dust discs about 100 times denser than the solar zodiacal cloud can be tolerated in order to survey at least 150 targets during the mission lifetime. Considering modeled resonant structures created by an Earth-like planet orbiting at 1 AU around a Sun-like star, we show that the tolerable dust density for planet detection goes down to about 15 times the solar zodiacal density for face-on systems and decreases with the disc inclination. The upper limits on the tolerable exozodiacal dust density derived in this study must be considered as rather pessimistic, but still give a realistic estimation of the typical sensitivity that we will need to reach on exozodiacal discs in order to prepare the scientific programme of future Earth-like planet characterisation missions.

Affiliated with

Also associated with

No associations

Rating

Nulling interferometry: impact of exozodiacal clouds on the performance of future life-finding space missions 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 Nulling interferometry: impact of exozodiacal clouds on the performance of future life-finding space missions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nulling interferometry: impact of exozodiacal clouds on the performance of future life-finding space missions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-716062