David's Astronomy Pages (Projects)
Extrasolar Planet Stars

This page summarises images and observations of selected stars that are known to have extrasolar planets that are detectable as small brightness decreases during transit of the planet across the host sol.

Bullet Selected Extrasolar Planet Sols
Bullet HD 149026
Bullet HD 189733
Bullet HD 209458 (Osiris)
Bullet HAT-P-1 (ADS 16402 AB)
Bullet HAT-P-2 (HD 147506) 
Bullet HAT-P-3 (GSC 3466:819)
Bullet HAT-P-5 (GSC 2634:1087)
Bullet TrES-1 (GSC 2652:1324)
Bullet TrES-2 (GSC 3549:2811)
Bullet TrES-3 (GSC 3089:929)
Bullet TrES-4 (GSC 2620:648)
Bullet WASP-1 (GSC 2265:107)
Bullet WASP-2 (GSC 522:1199)
Bullet XO-1 (GSC 2041:1657) 
Bullet XO-2
Bullet Future Project Stars  
 

 


Selected Extrasolar Planet Stars

Web Resources 
SolStation - Notable nearby stars  [http://www.solstation.com/stars.htm

TransitSearch.Org TransitSearch.org   { Check for Transits

The Extrasolar Planets Encyclopaedia  [http://exoplanet.eu ]

Summary Table of parameters for transiting planets [ http://www.inscience.ch/transits/  ]

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HD 149026 - Parent Star to Exosolar Planet

HD 149026 (Hercules)
Image
Annotated CCD Image 
3 x 30s (average combine), C filter)
2006-07-23 22:50h UT (#131053-55)
 
Monitoring HD 149026 for small magnitude changes during exosolar 
planet transits will be difficult due to the lack of a suitable 
reference star of similar brightness within the same field of view.

Less accurate method of monitoring will be to alternate frames of 
HD 149026 with frames from offset reference star.
 Possible offset stars :
 
HIP 80885  (Hercules)
HIP 80885 is actually a double star (Struve 2059) 
with 1 arc sec separation (too small to be 
seen at resolution of image)
Image 
CCD Image 
3 x 15s (average combine), C filter)
2006-07-23 23:14h UT (#131092-94)

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HD 189733 - Parent Star to Exosolar Planet

HD 189733 (Vulpecula)
This star has an extra-solar planet (HD 189733b), whose transit should just be 
detectable as a slight dimming of the sol star. This will be a future observing challenge.
In preparation some baseline frames were acquired in V and B bands.
 

Image
Approximate Colour CCD Image
Luminance : 3 x 30s  (median combine, C Filter), 
Red : 3 x 30s (medium combine, R filter),
Green : 3 x 30s (medium combine, V filter),
Blue : 3 x 60s (medium combine, B filter)
2006-04-27 02:46h UT (#117200-11)
 
HD 189733 - B Band
Image
Annotated CCD Image
20 sec exposure, 2x2 binning, B Filter 
2006-04-28 00:22 h UT (#118196)
 
HD 189733 - V Band
Image
CCD Image
10 sec exposure, 2x2 binning, V Filter 
2006-04-28 00:22 h UT (#118197)

Tests suggest imaging at 60s (B) and 30s (V) to improve S/N 

HIP 98523 catalog mag : 9.46 (B),  8.19 (V),   (B-V  1.27)
HD 189733 catalog mag : 8.87 (B), 7.79 (V),  (B-V  1.08)
HD 345458 catalog mag : 11.39 (B), 10.73 (V),    (B-V  0.66)

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HD 209458 (Osiris) - Star with Extra-Solar Planet

HD 209458 (Pegasus)
Alt Names : Osiris, GCVS V0376 Peg, SAO 107623, HIP 108859
Image
CCD Image 
60s (C filter)
2006-07-18 01:09 hUT (#130108)
  
Example V Filter image of HD 209458
HD 209458 (V), HD 209346 (C), GSC 1688:1766 (K)
Image
Annotated CCD Image
15 sec exposure (V filter)
2005-08-05  22:30h UT(#91090)
Other Images : 2002-10-022004-08-20 / 2005-08-05

Dry Run Analysis 2004-08-20 | Transit Analysis 2005-08-08

Transit Detection Attempt, 2005-08-08
- 4h 20m session attempting to record the transit of extra solar planet HD 209458b across its sol HD 209458 (Osiris)
- 552 images were recorded over a period of 3h 50m  (15 sec exposures through V filter)
- Inconsistent sky conditions and deteriorating sky conditions with cloud after 01:00 h UT reduced data quality.
- A description of the attempt and results has been compiled. 
- Analysis suggests an overall dimming of ~ 0.01 mag during the time of the transit, but this is unfortunately within the 
uncertainty range of the measurement (typically +/- 0.01 to +/- 0.02 mag). Detection of the dimming event was also compromised by having insufficient data prior to ingress and deteriorating sky conditions around the time of egress. 

Graph showing differential magnitudes for HD 209458 
(Corrected for B-V colour difference between HD 209458 and Comparison Star)
Image 
Graphs shows points representing the average differential magnitude 
in each 5 min period. High/Low lines are plotted at +/- 1 S.D. 
Data may possibly shows an overall dimming of ~ 0.01 mag during 
the time of the transit, but this is unfortunately within the 
uncertainty range of the measurement (typically +/- 0.01 to +/- 0.02 mag).
Detection of dimming is also compromised by having insufficient data prior to ingress
and deteriorating sky conditions with cloud around the time of egress.

 

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HAT-P-1 (ADS 16402 AB) -  Parent Star to Exosolar Planet  HAT-P-1b

ADS 16402  (Lacerta)

Using small automated telescopes in Arizona and Hawaii, the HATNet project has detected an 
object transiting one member of the double star system ADS 16402 AB. This system is a pair 
of G0 main-sequence stars with age about 3 Gyr at a distance of ~139 pc and projected separation 
of ~1550 AU. The transit signal has a period of 4.46529 days and depth of 0.015 mag.

 

ADS 16402 (Lacerta)
Alt Name : B+37 4734 / HAT-P-1

Image
CCD Image 
5 x 30s exposure (average combine), 2x2 binning, C Filter
2006-10-22 19:26h UT (#148054-58)
BBC Report  
Science Paper 

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HAT-P-2 (HD 147506), Parent Star to Exosolar Planet

HAT-P-2 / HD 147506 (Hercules)

Image
Annotated CCD Image 
3 x 60s (average combine), 2x2 binning, C Filter
2007-05-07 23:23 hUT (#196053-61)
 
HAT-P-2, Reference Stars
Image
Annotated CCD Image 
20s, 2x2 binning, R Filter
2007-05-07 23:31 hUT (#196065)

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HAT-P-3 (GSC 3466:819) - Parent Star to Exosolar Planet

Baseline images of HAT-P-3 parent star (GSC 3466:819) were acquired as part of a a future project to attempt to detect the transit of an exosolar planet using my 8" LX200 scope. HAT-P-3 was only recently discovered (Torres et al, 2007, http://exoplanet.eu/papers/torres_2007.pdf ). It rotates around its host star in ~ 2.9 days, and has a reported transit time of 2.06 hours.

HAT-P-3 Parent Star / GSC 3466:819  (Ursa Major)
Image
Annotated CCD Image 
3 x 30 sec exposure (median combine), 2x2 binning, C Filter
2007-08-13 22:25h UT (#204079-87)
 
Reference Stars
Image
Annotated CCD Image 
60 sec exposure, 2x2 binning, R Filter
2007-08-08 13 22:32h UT (#204091)

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HAT-P-5 (GSC 2634:1087) - Parent Star to Exosolar Planet

Baseline images of HAT-P-5 parent star (GSC 2634:1087) were acquired as part of a a future project to attempt to detect the transit of an exosolar planet using my 8" LX200 scope. HAT-P-5 was only recently discovered (reference) . It rotates around its host star in ~ x,x days, and has a reported transit time of x.xx hours.

HAT-P-5 Parent Star / GSC GSC 2634:1087 (Lyra)
Image
Annotated CCD Image 
3 x 60 sec exposure (average combine), 2x2 binning, C Filter
2008-06-08 23:36h UT (#290040-44)
 
HAT-P-5  - Reference Stars 
Image
Annotated CCD Image 
2 x 60 sec exposure (average combine), 2x2 binning, R Filter
2008-06-08 23:42h UT (#290040-44)

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TrES-1 / GSC 2652:1324 - Parent Star to Exosolar Planet

TrES-1 Parent Star / GSC 2652:1324 (Lyra)
~ 500 light years, distance
Planet orbit 3.03 days
Image
Annotated CCD Image 
3 x 20s (average combine), C filter)
2006-07-23 23:32h UT (#131124-26)
 
Note : Discrepancy seen with GSC 2652:1291 (V Band) mag.
Catalog +11.2,  Measured Estimate +10.3. 
Recommend monitoring for variability

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TrES-2 (GSC 3549:2811) - Parent Star to Exosolar Planet

TrES-2 Parent Star / GSC 3549:2811 (Draco)
< 750 light years, distance
Planet orbit 2.47063 days
 V Magnitude: +11.4 , Spectral Type: G0V ]
Image
CCD Image 
3 x 60 sec exposure (average combine), 2x2 binning, C Filter
2006-11-26 19:30h UT (#155074-82)
 
Colour Images
Image
Approximate Colour CCD Image 
BVR, 2x2 binning
Red 3x60s (R Filter), 
Green 3x60s (V Filter), Blue 3x120s (B Filter)
2006-11-26 19:30h UT (#155075-85)
Image
Approximate Colour CCD Image 
CBVR, 2x2 binning
Luminance : 3 x 60s (C Filter), Red 3x60s (R Filter), 
Green 3x60s (V Filter), Blue 3x120s (B Filter)
2006-11-26 19:30h UT (#155075-85)
Reference Stars
Image
CCD Image 
3 x 60 sec exposure (average combine), 
2x2 binning, C Filter
2006-11-26 19:30h UT (#155074-82)

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TrES-3 (GSC 3089:929) - Parent Star to Exosolar Planet

Baseline images of TrES-3 parent star (GSC 3089:929 ) were acquired as part of a project to attempt to detect the transit of an exosolar planet using my 8" LX200 scope. TrES-3b was recently discussed to orbit this star. (TrES team,  2007, http://xxx.lanl.gov/PS_cache/arxiv/pdf/0705/0705.2004v1.pdf )

TrES-3 Parent Star / GSC 3089:929 (Hercules)
Image
Annotated CCD Image 
3 x 60 sec exposure (average combine), 2x2 binning, C Filter
2007-08-13 23:02h UT (#203194-98)
 
Reference Stars
Image
Annotated CCD Image 
60 sec exposure, 2x2 binning, R Filter
2007-08-13 23:07h UT (#204124)

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TrES-4 (GSC 2620:648) - Parent Star to Exosolar Planet

Baseline images of TrES-4 parent star (GSC 2620:648) were acquired as part of a project to detect the transit of the exosolar planet, that has recently been discussed to orbit this star .  [ BBC news article]

TrES-4 Parent Star / GSC 2620:648 (Hercules)
Image
Annotated CCD Image 
3 x 60 sec exposure (average combine), 2x2 binning, C Filter
2007-08-08 01:09h UT (#203194-98)
 
Reference Stars
Image
Annotated CCD Image 
30 sec exposure, 2x2 binning, R Filter
2007-08-08 01:09h UT (#203195)

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WASP-1 (GSC 2265:107) - Parent Star to Exosolar Planet

Baseline images of WASP-1 parent star (GSC 2265:107) as part of a project to attempt to detect the transit of an exosolar planet using my 8" LX200 scope.  [WASP-1 paper : http://www.blackwell-synergy.com/doi/abs/10.1111/j.1365-2966.2007.11976.x ]

WASP-1  (GSC 2265:107) (Andromeda)
Image
Annotated CCD Image 
3 x 30 sec exposure (median combine), 2x2 binning, C Filter
2007-08-14 00:24h UT (#204224-28)
 
WASP-1  (GSC 2265:107) (Andromeda)
Image
Annotated CCD Image 
3 x 45 sec exposure (median combine), 2x2 binning, C Filter
2007-08-18 00:20h UT (#205011-15)
 
Reference Stars
Image
Annotated CCD Image 
60 sec exposure, 2x2 binning, R Filter
2007-08-18 00:24h UT (#205017)

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WASP-2 (GSC 522:1199)  - Parent Star to Exosolar Planet

Baseline images of WASP-2 parent star (GSC 522:1199) were acquired as part of a project to attempt to detect the transit of an exosolar planet using my 8" LX200 scope. WASP-2b was recently discussed to orbit this star. 

WASP-2 (GSC 522:1199)  (Delphinus)
Image
Annotated CCD Image 
3 x 60 sec exposure (median combine), 2x2 binning, C Filter
2007-08-14 00:32h UT (#203232-36)
 
Reference Stars
Image
Annotated CCD Image 
45 sec exposure, 2x2 binning, R Filter
2007-08-14 00:30h UT (#204233)

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XO-1 (GSC 2041:1657)

Web Info : XO-1 -  McCollough et al. paper  

XO-1 (Corona Borealis)
This star has an extra-solar planet (XO-1b), whose transit can be 
detectable as a slight dimming of the sol star. 
This will be a future observing challenge

XO-1 : GSC 2041:1657
1 : GSC 2041:186,   2 : GSC 2041:976

Image
Annotated CCD Image
3 x 30s exposure (average combine), 2x2 binning, C Filter 
2006-05-24 23:18 hUT (#127028-30)

 

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XO-2, Parent Star to Exosolar Planet

XO-2 / GSC 3413:5 (Lynx)

Image
Annotated CCD Image 
3 x 60s (average combine), 2x2 binning, C Filter
2007-05-07 22:56 hUT (#196028-30)
 
XO-2, Reference Stars
Image
Annotated CCD Image 
30s, 2x2 binning, R Filter
2007-05-07 23:07 hUT (#196040)

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Future Project Stars

Potential Future Project Stars

CoRoT-Exo-1 (Host Star    . http://exoplanet.eu/papers/PR-CoRoT-1.pdf 

GJ 436, Leo

HAT-P-5 (2634:1087)  -  http://www.perseus.gr/Astro-Photometry-HAT-P-5-20080528.htm 

 

Monitor TransitSearch.org for new or potential transiting planets.

Web Information on notable nearby stars :  http://www.solstation.com/stars.htm 

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