scholarly journals Spectroscopic direct detection of reflected light from extrasolar planets

2013 ◽  
Vol 436 (2) ◽  
pp. 1215-1224 ◽  
Author(s):  
J. H. C. Martins ◽  
P. Figueira ◽  
N. C. Santos ◽  
C. Lovis
2020 ◽  
Vol 634 ◽  
pp. A69 ◽  
Author(s):  
S. Hunziker ◽  
H. M. Schmid ◽  
D. Mouillet ◽  
J. Milli ◽  
A. Zurlo ◽  
...  

Aims. RefPlanets is a guaranteed time observation programme that uses the Zurich IMaging POLarimeter (ZIMPOL) of Spectro-Polarimetric High-contrast Exoplanet REsearch instrument at the Very Large Telescope to perform a blind search for exoplanets in wavelengths from 600 to 900 nm. The goals of this study are the characterisation of the unprecedented high polarimetic contrast and polarimetric precision capabilities of ZIMPOL for bright targets, the search for polarised reflected light around some of the closest bright stars to the Sun, and potentially the direct detection of an evolved cold exoplanet for the first time. Methods. For our observations of α Cen A and B, Sirius A, Altair, ɛ Eri and τ Ceti we used the polarimetricdifferential imaging (PDI) mode of ZIMPOL which removes the speckle noise down to the photon noise limit for angular separations ≿0.6′′. We describe some of the instrumental effects that dominate the noise for smaller separations and explain how to remove these additional noise effects in post-processing. We then combine PDI with angular differential imaging as a final layer of post-processing to further improve the contrast limits of our data at these separations. Results. For good observing conditions we achieve polarimetric contrast limits of 15.0–16.3 mag at the effective inner working angle of ~0.13′′, 16.3–18.3 mag at 0.5′′, and 18.8–20.4 mag at 1.5′′. The contrast limits closer in (≾0.6′′) display a significant dependence on observing conditions, while in the photon-noise-dominated regime (≿0.6′′) the limits mainly depend on the brightness of the star and the total integration time. We compare our results with contrast limits from other surveys and review the exoplanet detection limits obtained with different detection methods. For all our targets we achieve unprecedented contrast limits. Despite the high polarimetric contrasts we are not able to find any additional companions or extended polarised light sources in the data obtained so far.


2020 ◽  
Vol 132 (1016) ◽  
pp. 104502
Author(s):  
Thayne Currie ◽  
Eugene Pluzhnik ◽  
Olivier Guyon ◽  
Ruslan Belikov ◽  
Kelsey Miller ◽  
...  

Icarus ◽  
2005 ◽  
Vol 178 (2) ◽  
pp. 570-588 ◽  
Author(s):  
Bertrand Mennesson ◽  
Alain Léger ◽  
Marc Ollivier

2007 ◽  
Vol 8 (3-4) ◽  
pp. 365-373 ◽  
Author(s):  
Bruce Macintosh ◽  
James Graham ◽  
David Palmer ◽  
Rene Doyon ◽  
Don Gavel ◽  
...  

2013 ◽  
Vol 8 (S299) ◽  
pp. 1-11 ◽  
Author(s):  
Beth Biller

AbstractThe last decade has yielded the first images of exoplanets, considerably advancing our understanding of the properties of young giant planets. In this talk I will discuss current results from ongoing direct imaging efforts as well as future prospects for detection and characterization of exoplanets via high contrast imaging. Direct detection, and direct spectroscopy in particular, have great potential for advancing our understanding of extrasolar planets. In combination with other methods of planet detection, direct imaging and spectroscopy will allow us to eventually: 1) study the physical properties of exoplanets (colors, temperatures, etc.) in depth and 2) fully map out the architecture of typical planetary systems. Direct imaging has offered us the first glimpse into the atmospheric properties of young high-mass (3-10 MJup) exoplanets. Deep direct imaging surveys for exoplanets have also yielded the strongest constraints to date on the statistical properties of wide giant exoplanets. A number of extremely high contrast exoplanet imaging instruments have recently come online or will come online within the next year (including Project 1640, SCExAO, SPHERE, GPI, among others). I will discuss future prospects with these instruments.


2006 ◽  
Vol 14 (17) ◽  
pp. 7515 ◽  
Author(s):  
T. Fusco ◽  
G. Rousset ◽  
J.-F. Sauvage ◽  
C. Petit ◽  
J.-L. Beuzit ◽  
...  

2009 ◽  
Vol 5 (H15) ◽  
pp. 718-719
Author(s):  
Anthony Boccaletti ◽  
Alessandro Sozzetti ◽  
Jean Schneider ◽  
Pierre Baudoz ◽  
Giovanna Tinetti ◽  
...  

AbstractThe SEE COAST concept is designed with the objective to characterize extrasolar planets and possibly Super Earths via spectro-polarimetric imaging in reflected light. A space mission complementary to ground-based near IR planet finders is a first secure step towards the characterization of planets with mass and atmosphere comparable to that of the Earth. The accessibility to the Visible spectrum is unique and with important scientific returns.


Sign in / Sign up

Export Citation Format

Share Document