2022A&A...657A.102M


Query : 2022A&A...657A.102M

2022A&A...657A.102M - Astronomy and Astrophysics, volume 657A, 102-102 (2022/1-1)

Detection capability of ground-based meter-sized telescopes for shallow exoplanet transits.

MALLONN M., POPPENHAEGER K., GRANZER T., WEBER M. and STRASSMEIER K.G.

Abstract (from CDS):

Meter-sized ground-based telescopes are frequently used today for the follow-up of extrasolar planet candidates. While the transit signal of a Jupiter-sized object can typically be detected to a high level of confidence with small telescope apertures as well, the shallow transit dips of planets with the size of Neptune and smaller are more challenging to reveal. We employ new observational data to illustrate the photometric follow-up capabilities of meter-sized telescopes for shallow exoplanet transits. We describe in detail the capability of distinguishing the photometric signal of an exoplanet transit from an underlying trend in the light curve. The transit depths of the six targets we observed, Kepler-94b, Kepler-63b, K2-100b, K2-138b, K2-138c, and K2-138e, range from 3.9 ppt down to 0.3 ppt. For five targets of this sample, we provide the first ground-based photometric follow-up. The timing of three targets is precisely known from previous observations, and the timing of the other three targets is uncertain and we aim to constrain it. We detect or rule out the transit features significantly in single observations for the targets that show transits of 1.3 ppt or deeper. The shallower transit depths of two targets of 0.6 and 0.8 ppt were detected tentatively in single light curves, and were detected significantly by repeated observations. Only for the target of the shallowest transit depth of 0.3 ppt were we unable to draw a significant conclusion despite combining five individual light curves. An injection-recovery test on our real data shows that we detect transits of 1.3 ppt depth significantly in single light curves if the transit is fully covered, including out-of-transit data toward both sides, in some cases down to 0.7 ppt depth. For Kepler-94b, Kepler-63b, and K2-100b, we were able to verify the ephemeris. In the case of K2-138c with a 0.6 ppt deep transit, we were able to refine it, and in the case of K2-138e, we ruled out the transit in the time interval of more than ±1.5 σ of its current literature ephemeris.

Abstract Copyright: © ESO 2022

Journal keyword(s): methods: observational - techniques: photometric - planets and satellites: fundamental parameters

VizieR on-line data: <Available at CDS (J/A+A/657/A102): list.dat photom.dat>

Simbad objects: 11

goto Full paper

goto View the references in ADS

Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 K2-100 Ro* 08 38 24.3002838928 +20 06 21.828057218   11.085 10.521     G0V 86 0
2 K2-100b Pl 08 38 24.3004849747 +20 06 21.828303951           ~ 48 0
3 WASP-103b Pl 16 37 15.5753608801 +07 11 00.119024745           ~ 158 1
4 Kepler-94 Ro* 18 44 46.7440377288 +47 29 49.749482616           M0V 59 0
5 Kepler-94b Pl 18 44 46.7441195652 +47 29 49.746742707           ~ 47 0
6 Kepler-63 Ro* 19 16 54.2861367672 +49 32 53.451062520   12.36 12.02     G5 102 1
7 Kepler-63b Pl 19 16 54.2861871448 +49 32 53.450828682           ~ 58 1
8 K2-138b Pl 23 15 47.7685349429 -10 50 58.897706806           ~ 11 0
9 K2-138e Pl 23 15 47.7685349429 -10 50 58.897706806           ~ 11 0
10 K2-138c Pl 23 15 47.7685349429 -10 50 58.897706806           ~ 10 0
11 K2-138 * 23 15 47.7686067840 -10 50 58.895461284   13.01 12.21 12.12 11.40 ~ 36 0

To bookmark this query, right click on this link: simbad:objects in 2022A&A...657A.102M and select 'bookmark this link' or equivalent in the popup menu


2023.01.30-21:59:16

© Université de Strasbourg/CNRS

    • Contact