2019ApJ...882L...1F

Query : 2019ApJ...882L...1F

2019ApJ...882L...1F - Astrophys. J., 882, L1-L1 (2019/September-1)

Earth as an exoplanet: a two-dimensional alien map.

FAN S., LI C., LI J.-Z., BARTLETT S., JIANG J.H., NATRAJ V., CRISP D. and YUNG Y.L.

Abstract (from CDS):

Resolving spatially varying exoplanet features from single-point light curves is essential for determining whether Earth-like worlds harbor geological features and/or climate systems that influence habitability. To evaluate the feasibility and requirements of this spatial-feature resolving problem, we present an analysis of multi-wavelength single-point light curves of Earth, where it plays the role of a proxy exoplanet. Here, ∼10,000 Deep Space Climate Observatory/Earth Polychromatic Imaging Camera frames collected over a two-year period were integrated over the Earth's disk to yield a spectrally dependent point source and analyzed using singular value decomposition. We found that, between the two dominant principal components (PCs), the second PC contains surface-related features of the planet, while the first PC mainly includes cloud information. We present the first two-dimensional (2D) surface map of Earth reconstructed from light curve observations without any assumptions of its spectral properties. This study serves as a baseline for reconstructing the surface features of Earth-like exoplanets in the future.

Journal keyword(s): Exoplanet astronomy - Exoplanet atmospheres - Exoplanet atmospheric variability - Exoplanet detection methods - Exoplanet surface characteristics - Exoplanet surface composition - Exoplanet surface variability - Exoplanets - Extrasolar rocky planets

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	TRAPPIST-1e	Pl	23 06 29.3684948589	-05 02 29.037301866						~	384	0

Query : 2019ApJ...882L...1F

Basic data :

TRAPPIST-1e -- Extra-solar Planet
Other object types:	`Pl (K2,TRAPPIST)`, `Pl? (2017Natur)`
ICRS coord. (ep=J2000) :	`23 06 29.3684948589 -05 02 29.037301866 (Optical) [ 0.0616 0.0536 90 ] A 2020yCat.1350....0G`
FK4 coord. (ep=B1950 eq=1950) :	`23 03 51.0517537596 -05 18 18.816867780 [ 0.0616 0.0536 90 ]`
Gal coord. (ep=J2000) :	`069.7127808375832 -56.6446053686932 [ 0.0616 0.0536 90 ]`
Proper motions mas/yr :	`930.788 -479.038 [0.087 0.070 90] A` `2020yCat.1350....0G`
Parallaxes (mas):	`80.2123 [0.0716] A` `2020yCat.1350....0G`

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K2-112e TRAPPIST-1e

References (384 between 1850 and 2026) (Total 384)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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