The nets project the network of transit survey
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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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星網計劃 The NETS Project: The NEtwork of Transit Survey

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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


Tres 2

TrES-2


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


Tsing hua station

Tsing-Hua Station


Image taken at tsing hua

Image Taken at Tsing-Hua


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)


A light curve

a light curve


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 weather humidity

The Weather: Humidity


The weather temperature

The Weather: Temperature


Enclosure testing

Enclosure Testing


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


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