| | |
| | |
Stat |
Members: 3643 Articles: 2'488'730 Articles rated: 2609
29 March 2024 |
|
| | | |
|
Article overview
| |
|
Multiplexing Precision RVs: Searching for Close in Gas Giants in Open Clusters | John I. Bailey III
; Mario Mateo
; Russel J. White
; Stephen A. Shectman
; Jeffrey D. Crane
; Edward W. Olszewski
; | Date: |
29 Mar 2016 | Abstract: | We present a multiplexed, high-resolution (R~50,000 median) spectroscopic
survey designed to detect exoplanet candidates in two southern star clusters
(NGC 2516 and NGC 2422) using the Michigan/Magellan Fiber System (M2FS) on the
Magellan/Clay telescope at Las Campanas Observatory. With 128 available fibers
in our observing mode, we are able to target every star in the core half-degree
of each cluster that could plausibly be a solar-analog member. Our
template-based spectral fits provide precise measurements of fundamental
stellar properties - $T_{eff}$ ($pm$30 K), [Fe/H] and [$alpha$/Fe] ($pm$0.02
dex), and $v_rsin(i)$ ($pm$0.3 km/s) - and radial velocities (RVs) by using
telluric absorption features from 7160 to 7290 $AA$ as a wavelength reference
for 251 mid-F to mid-K stars (126 in NGC 2516 and 125 in NGC 2422) that
comprise our survey. In each cluster we have obtained ~10-12 epochs of our
targets. Using repeat observations of an RV standard star we show our approach
can attain a single-epoch velocity precision of 25 m/s to 60 m/s over a broad
range of S/N throughout our observational baseline of 1.1 years. Our technique
is suitable for non-rapidly rotating stars cooler than mid-F. In this paper we
describe our observational sample, analysis methodology, and present a detailed
study of the attainable precision and measurement capabilities of our approach.
Subsequent papers will provide results for stars observed in the target
clusters, analyze our dataset of RV time-series for stellar jitter and stellar
and sub-stellar companions, and consider the implications of our findings on
the clusters themselves. | Source: | arXiv, 1603.8673 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |