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星網計劃 The NETS Project: The NEtwork of Transit Survey. 江瑛貴 Ing-Guey Jiang National Tsing-Hua Univ., Taiwan. Outline. Introduction Why transit ? Why another transit survey ? Tsing-Hua Station The Previous Progress The Next Step. Why Transit ?. It is simple & fast can scan more stars

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the nets project the network of transit survey

星網計劃The NETS Project: The NEtwork of Transit Survey

江瑛貴

Ing-Guey Jiang

National Tsing-Hua Univ., Taiwan

outline
Outline
  • Introduction
  • Why transit ?
  • Why another transit survey ?
  • Tsing-Hua Station
  • The Previous Progress
  • The Next Step
why transit
Why Transit ?
  • It is simple & fast
  • can scan more stars
  • It can determine the planetary orbital plane
  • And also size & mass of planets
  • It could be done by smaller telescopes
  • So, the cost is low
  • The timing of transit might be useful
tres network
TrES Network
  • The Trans-atlantic Exoplanet Survey (TrES)
  • Wide-field photometric surveys by small telescopes
  • Maximizing the monitered stars
  • Minimizing the time required of large telescopes
  • 3 small telescopes (10 cm) at (1) Tenerife, Spain; (2) Lowell Observatory, Arizona; (3) Mount Palomar, California
  • field of view: 6 degree
  • Spatial resolution: 11 arcsec/pixel
hat p 9b
HAT-P-9b
  • HAT: Hungarian-made Automated Telescope
  • NATnet: 6 small (11 cm), wide field (8 by 8 deg) telescpes
  • Data was taken in 2004 and 2005
  • Transit was found from data
  • Then, do following up
why another transit survey
Why Another Transit Survey ?
  • The current on-going projects can only monitor up to a few tens thousand stars
  • To do a better job, we hope to monitor 10,000,000 (for 7 cm telescope) or 160,000,000 (for 12 cm telescope) stars
  • This will improve the statistics in the field of exoplanets
  • We hope to constrain long period exoplanets, too
  • We need a lot of time but small telescopes
another way of sky survey
Another Way of Sky Survey ?
  • Permanent non-tracking fixed telescopes
  • Drift Scan
  • Scan stars while the Earth Rotating
  • Can monitor much more stars automatically
  • Use an array of telescopes to continue the monitoring
  • It only suitable for certain events if the time scales are right
  • Data analysis is slightly more complicated
would we miss any planets
Would we miss any planets ?
  • Yes, but … (comparing with other projects)
  • For short period planets, the transit event would repeat. We will detect them finally.
  • For long period planets, the transit probability is much lower, so need to scan much more stars.
  • We get some constraints on the number of possible planets with longer periods
preliminary analysis
Preliminary Analysis
  • Sky Backgroud 3000 ADU
  • Many stars have 40000 to 50000 ADU
  • So, S/N is more than 10
  • It is possible to do observations at Tsing-Hua Station
  • Flux variation is about several percent
  • The same order as O’Donovan et al. (2006)
the previous progress
The Previous Progress
  • Oct. 2006: A prototype CCD-lens system is constructed
  • Jan. 2007: It took some testing data at Lulin
  • Feb. 2007: Starting the code development for data analysis (on going)
  • March 2007: Starting to plan the enclosure
  • April 2007: Observe with other telescopes
  • Oct. 2007: Theoretical Modeling of light curve
the more previous progress
The More Previous Progress
  • July 2007: Weather Station arrived
  • Aug. 2007: WebCam (USB and PCI)
  • Nov. 2007: New Computer
  • Dec. 2007: Constructing the Enclosure
  • March 2008: Code for Enclosure Control
  • June 2008: CCD Install
  • Nov. 2008: Tsing-Hua Station Working
the automatic observation
The Automatic Observation
  • Setting the time interval of observation
  • Open the enclosure on time
  • Only open when weather & UPS are o.k.
  • Start CCD whenever the enclosure is open
  • Stop CCD, stop taking images
  • Close due to weather condition, UPS
  • Close and stop observation when time is up
the next step
The Next Step
  • Developing the data pipeline
  • Developing the codes
  • With the HAT results and our testing data, it is feasible.
  • We shall prepare to construct an oversea station, which will lead to scientific data
  • We shall think/talk about following up facilities
ad