研究目的
To investigate the evolution of the transit of the disintegrating planet K2-22b and to compare the findings with previous observations from 2014 and 2015.
研究成果
The study found that the transit depths of K2-22b are variable and consistent with previous observations. There is evidence of ongoing variability in the transit shape and time, but no strong evidence of wavelength-dependent transit depths. The findings suggest that continued monitoring is necessary to further constrain the evolution timescale of disintegrating planets.
研究不足
The overall shallowness of the transit makes a detailed analysis of transit parameters difficult. The photometric precision of the data limits the investigation of transit-like variability outside of predicted transit windows.
1：Experimental Design and Method Selection:
The study involved collecting 45 ground-based photometric observations of the K2-22 system to investigate the transit of K2-22b. The methodology included using telescopes ranging in size from
2：2b. The methodology included using telescopes ranging in size from 5 to 4 m and spanning optical to near-infrared wavelengths. Sample Selection and Data Sources:
0.5 to 10.4 m and spanning optical to near-infrared wavelengths. 2. Sample Selection and Data Sources: Observations were collected between 2016 December and 2017 May, covering multiple transit epochs of K2-22b.
3：2b. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The study utilized various telescopes and instruments, including the Anglo-Australian Telescope (AAT), Fred Lawrence Whipple Observatory (FLWO), Gao Mei Gu Observatory (GAO), Gran Telescopio Canarias (GTC), Las Cumbres Observatory (LCO), The Swope Telescope, Thai National Observatory (TNO), University of Louisville Manner Telescope (ULMT), and Wisconsin-Indiana-Yale-NOAO Observatory (WIYN).
4：Experimental Procedures and Operational Workflow:
The observations involved photometric monitoring of the K2-22 system, with data reduction and analysis performed using standard procedures and software tools like ASTROIMAGEJ, Astrometry.net, Astropy, SEXTRACTOR, FITSH, and IRAF.
5：Data Analysis Methods:
The analysis included light curve modeling using the Mandel & Agol (2002) model, correction for the flux contribution from a nearby companion star, and investigation of wavelength-dependent transit depths.
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IRIS2 camera
HAWAII-1 HgCdTe detector
Anglo-Australian Telescope (AAT)
Near-infrared light curves observation
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KeplerCam
Fairchild CCD486
Fred Lawrence Whipple Observatory (FLWO)
Photometric observation
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Andor iKon-L 936
2K×2K CCD camera
Gao Mei Gu Observatory (GAO)
Photometric observation
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OSIRIS instrument
R1000R grism
Gran Telescopio Canarias (GTC)
Long-slit spectroscopy
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Sinistro detector
4K×4K
Las Cumbres Observatory (LCO)
Photometric observation
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E2V CCD
4K×4K
The Swope Telescope
Photometric observation
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ULTRASPEC
frame-transfer electron-multiplying CCD (EMCCD)
Thai National Observatory (TNO)
High-speed photometry
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SBIG STX-16803 CCD
4K×4K
University of Louisville Manner Telescope (ULMT)
Photometric observation
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WHIRC
Raytheon Virgo HgCdTe detector
Wisconsin-Indiana-Yale-NOAO Observatory (WIYN)
High-resolution infrared observation
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