Sagittarius Window Eclipsing Extrasolar Planet Search

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The Sagittarius Window Eclipsing Extrasolar Planet Search, or SWEEPS, was a 2006 astronomical survey project using the Hubble Space Telescope's Advanced Camera for Surveys - Wide Field Channel to monitor 180,000 stars for seven days to detect extrasolar planets via the transit method.[1]

Area examined

File:HST SWEEPS Galaxy Location-2006.jpg
SWEEPS search area.
File:HST SWEEPS Galaxy Bulge 2006.jpg
SWEEPS search area detail.

The stars that were monitored in this astronomical survey were all located in the Sagittarius-I Window.[2] The Sagittarius Window is a rare view to the Milky Way's central bulge stars: our view to most of the galaxy's central stars is generally blocked by lanes of dust.[3] These stars in the galaxy's central bulge region are approximately 27,000 light years from Earth.[2]

Planets discovered

Sixteen candidate planets were discovered with orbital periods ranging from 0.6 to 4.2 days. Planets with orbital periods less than 1.2 days have not previously been detected, and have been dubbed "ultra-short period planets" (USPPs) by the search team. USPPs were discovered only around low-mass stars, suggesting that larger stars destroyed any planets orbiting so closely or that planets were unable to migrate as far inward around larger stars.[4]

Planets were found with roughly the same frequency of occurrence as in the local neighborhood of Earth.[2]

SWEEPS-4 and SWEEPS-11 orbited stars that were sufficiently visually distinct from their neighbors that follow-up observations using the radial velocity method were possible, allowing their masses to be determined.[2]

This table is constructed from information obtained from the Extrasolar Planets Encyclopedia and SIMBAD databases that reference the Nature article as their source.[4]

Star Constellation Right
ascension 		Declination App.
mag. 		Distance (ly) Spectral
type 		Planet Mass
(Template:Jupiter mass) 		Radius
(Template:Jupiter radius) 		Orbital
period
(d) 		Semimajor
axis
(AU) 		Orbital
eccentricity 		Inclination
(°) 		Discovery
year
SWEEPS J175853.29-291233.5 Sagittarius Template:RA Template:DEC 22.2 ~22000 SWEEPS-01 ? 1.01 1.56 0.025 ? 86+ 2006
SWEEPS J175853.38-291217.8 Sagittarius Template:RA Template:DEC 25.1 ~22000 SWEEPS-02 ? 1.37 0.912 0.015 ? 86+ 2006
SWEEPS J175853.57-291144.1 Sagittarius Template:RA Template:DEC 22.5 ~22000 SWEEPS-03 ? 0.87 1.27 0.021 ? 86+ 2006
SWEEPS J175853.92−291120.6 Sagittarius Template:RA Template:DEC 18.8 ~22000 SWEEPS-04 <3.8 0.81 4.2 0.055 ? 87+ 2006
SWEEPS J175854.60-291128.2 Sagittarius Template:RA Template:DEC 23.9 ~22000 SWEEPS-05 ? 1.09 2.313 0.030 ? 87+ 2006
SWEEPS J175857.29-291253.4 Sagittarius Template:RA Template:DEC 19.5 ~22000 SWEEPS-06 ? 0.82 3.039 0.042 ? 86+ 2006
SWEEPS J175857.69-291114.5 Sagittarius Template:RA Template:DEC 21.5 ~22000 SWEEPS-07 ? 0.9 1.747 0.027 ? 86+ 2006
SWEEPS J175859.24-291328.7 Sagittarius Template:RA Template:DEC 21.7 ~22000 SWEEPS-08 ? 0.98 0.868 0.017 ? 84+ 2006
SWEEPS J175859.60-291211.8 Sagittarius Template:RA Template:DEC 22.5 ~22000 SWEEPS-09 ? 1.01 1.617 0.025 ? 86+ 2006
SWEEPS J175902.00-291323.7 Sagittarius Template:RA Template:DEC 26.2 ~22000 SWEEPS-10 ? 1.24 0.424 0.008 ? 84+ 2006
SWEEPS J175902.67−291153.5 Sagittarius Template:RA Template:DEC 19.83 ~22000 SWEEPS-11 9.7 1.13 1.796 0.03 ? 84+ 2006
SWEEPS J175904.44-291317.1 Sagittarius Template:RA Template:DEC 21.8 ~22000 SWEEPS-12 ? 0.91 2.952 0.038 ? 87+ 2006
SWEEPS J175905.95-291305.6 Sagittarius Template:RA Template:DEC 21.38 ~22000 SWEEPS-13 ? 0.78 1.684 0.027 ? 86+ 2006
SWEEPS J175907.56-291039.8 Sagittarius Template:RA Template:DEC 22.38 ~22000 SWEEPS-14 ? 0.93 2.965 0.037 ? 87+ 2006
SWEEPS J175907.64-291023.7 Sagittarius Template:RA Template:DEC 25.66 ~22000 SWEEPS-15 ? 1.37 0.541 0.010 ? 84+ 2006
SWEEPS J175908.44-291140.6 Sagittarius Template:RA Template:DEC 23.78 ~22000 SWEEPS-16 ? 1.4 0.969 0.017 ? 85+ 2006

See also

References

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  1. ↑ Script error: No such module "citation/CS1".
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External links

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