Variable Stars Observed in the Galactic Disk by AST3-1 from Dome A, Antarctica

Wang, Lingzhi; Ma, Bin; Li, Gang; Hu, Yi; Fu, Jian-Ning; Wang, Lifan; Ashley, M. C. B.; Cui, Xiangqun; Du, Fujia; Gong, Xuefei; Li, Xiaoyan; Li, Zhengyang; Liu, Qiang; Pennypacker, C.; Shang, Zhaohui; Yuan, Xiangyan; York, Donald G.; Zhou, Ji-Lin

doi:10.3847/1538-3881/153/3/104

Cited by 21 publications

(16 citation statements)

References 93 publications

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“…Ground-based HDC observations will enable the detection of multiple molecular species and their resolved spectral lines in the J, H, K, L, and M bands (Wang et al 2017). Currently known directly imaged exoplanets (e.g., HR 8799bcde, 51 Eri b, ROXs 42B b, ROXs 12 b, β Pictoris b) will be prime targets for HDC observations.…”

Section: High-contrast High-resolution Spectroscopy Of Exoplanetsmentioning

confidence: 99%

Observing Exoplanets with High-dispersion Coronagraphy. II. Demonstration of an Active Single-mode Fiber Injection Unit

Mawet

Ruane

Xuan

et al. 2017

ApJ

116

105

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High-dispersion coronagraphy (HDC) optimally combines high-contrast imaging techniques such as adaptive optics/wavefront control plus coronagraphy to high spectral resolution spectroscopy. HDC is a critical pathway toward fully characterizing exoplanet atmospheres across a broad range of masses from giant gaseous planets down to Earth-like planets. In addition to determining the molecular composition of exoplanet atmospheres, HDC also enables Doppler mapping of atmosphere inhomogeneities (temperature, clouds, wind), as well as precise measurements of exoplanet rotational velocities. Here, we demonstrate an innovative concept for injecting the directly imaged planet light into a single-mode fiber, linking a high-contrast adaptively corrected coronagraph to a high-resolution spectrograph (diffraction-limited or not). Our laboratory demonstration includes three key milestones: close-to-theoretical injection efficiency, accurate pointing and tracking, and on-fiber coherent modulation and speckle nulling of spurious starlight signal coupling into the fiber. Using the extreme modal selectivity of single-mode fibers, we also demonstrated speckle suppression gains that outperform conventional image-based speckle nulling by at least two orders of magnitude.

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Section: High-contrast High-resolution Spectroscopy Of Exoplanetsmentioning

confidence: 99%

Observing Exoplanets with High-dispersion Coronagraphy. II. Demonstration of an Active Single-mode Fiber Injection Unit

Mawet

Ruane

Xuan

et al. 2017

ApJ

116

105

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“…Its unique location allows for continuous observations lasting longer than 24 hours during the austral winter. The continuous time coverage is important for many applications of time-domain astronomy (e.g., [32], [33] and [34]). It is equipped with a 10K×10K CCD camera in frame transfer mode that provides a field of view of 4.14 deg 2 [35].…”

Section: Instrument Observations and Data Reductionmentioning

confidence: 99%

Optical observations of LIGO source GW 170817 by the Antarctic Survey Telescopes at Dome A, Antarctica

Andreoni

et al. 2017

Science Bulletin

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The LIGO detection of gravitational waves (GW) from merging black holes in 2015 marked the beginning of a new era in observational astronomy. The detection of an electromagnetic signal from a GW source is the critical next step to explore in detail the physics involved. The Antarctic Survey Telescopes (AST3), located at Dome A, Antarctica, is uniquely situated for rapid response time-domain astronomy with its continuous night-time coverage during the austral winter. We report optical observations of the GW source (GW 170817) in the nearby galaxy NGC 4993 using AST3. The data show a rapidly fading transient at around 1 day after the GW trigger, with the i-band magnitude declining from 17.23 ± 0.13 magnitude to 17.72 ± 0.09 magnitude in ∼ 1.8 hour. The brightness and time evolution of the optical transient associated with GW 170817 are broadly consistent with the predictions of models involving merging binary neutron stars. We infer from our data that the merging process ejected about ∼ 10 −2 solar mass of radioactive material at a speed of up to 30% the speed of light.

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“…As shown by a series of previous studies (Crouzet et al 2010;Daban et al 2010;Law et al 2013), this greatly increases the detectability of transiting exoplanets with orbital periods longer than a few days. The outstanding photometric advantages of the Antarctic Plateau have been shown by the observing facilities at different sites, such as SPOT (Taylor et al 1988) at the South Pole, the small-IRAIT (Tosti et al 2006), ASTEP-South (Crouzet et al 2010) and ASTEP-400 (Daban et al 2010;Mékarnia et al 2016) at Dome C, and CSTAR (Wang et al 2011(Wang et al , 2014Yang et al 2015;Zong et al 2015;Oelkers et al 2016;Liang et al 2016) and AST3-I (Wang et al 2017;Ma et al 2018) at Dome A.…”

mentioning

confidence: 99%

Exoplanets in the Antarctic Sky. II. 116 Transiting Exoplanet Candidates Found by AST3-II (CHESPA) within the Southern CVZ of TESS

Zhang¹,

Zhang²,

Liang³

et al. 2019

ApJS

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We report first results from the CHinese Exoplanet Searching Program from Antarctica (CHESPA)a wide-field high-resolution photometric survey for transiting exoplanets carried out using telescopes of the AST3 (Antarctic Survey Telescopes times 3) project. There are now three telescopes (AST3-I, AST3-II, and CSTAR-II) operating at Dome A-the highest point on the Antarctic Plateau-in a fully automatic and remote mode to exploit the superb observing conditions of the site, and its long and uninterrupted polar nights. The search for transiting exoplanets is one of the key projects for AST3. During the austral winters of 2016 and 2017 we used the AST3-II telescope to survey a set of target multiple innovations in the telescope's snow-proofing and defrosting systems. As a result, AST3-II worked well during the extremely cold austral winters of 2016 and 2017, and acquired over 30 TB of high-quality images. During the observational seasons in austral winter, AST3-II is operated remotely and the scheduled observations are executed in a fully-automatic mode. The hardware and software for the facility-including the hardware operation monitor, telescope control computer, and data storage array-were developed by the National Astronomical Observatories, Chinese Academy of Sciences (NAOC) (Shang et al. 2012;Hu et al. 2016). The electrical power supply and internet communication were provided by a similarly reliable on-site observatory platform, PLATO-A, which is an improved version of the PLATO system developed by UNSW Sydney as an automated observatory platform for CSTAR and other earlier instruments. PLATO-A was designed to provide a continuous 1 kW power source, a warm environment for equipment, and internet communications to the AST3 telescopes for a year without servicing Ashley et al. 2010). OBSERVATIONSThe scientific background and observational strategy of CHESPA are described in Zhang et al. (2018). We summarize the key points here. The CHESPA program is dedicated to searching for transiting exoplanets in the southern polar sky at highly negative declinations. It has been running since 2012 using the CSTAR and AST3 telescopes, with a first batch of six exoplanet candidates published by Wang et al. (2014). To maximize collaboration with TESS and enhance the scientific importance of our searching program, we selected 48 target fields close to the South Ecliptic Pole (RA = 06 h 00 m 00 s , Dec = −66 • 33 00 ) and within the TESS ' Southern CVZ (Continuous Viewing Zone) (see Figure 1 and Table 1 for details). All target fields are and are suitable for low-airmass observation from Antarctica. Target stars located in these fields will also be monitored by TESS for continuous 12 month period. Thus, any candidate of interest found within these fields may be followed up and studied thoroughly in the future.These chosen fields are divided into three groups, each of which was originally scheduled for observation over an austral winter in we observed the first group consisting of 10 fields (AST3II004-AST3II013). The second group c...

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Variable Stars Observed in the Galactic Disk by AST3-1 from Dome A, Antarctica

Cited by 21 publications

References 93 publications

Observing Exoplanets with High-dispersion Coronagraphy. II. Demonstration of an Active Single-mode Fiber Injection Unit

Observing Exoplanets with High-dispersion Coronagraphy. II. Demonstration of an Active Single-mode Fiber Injection Unit

Optical observations of LIGO source GW 170817 by the Antarctic Survey Telescopes at Dome A, Antarctica

Exoplanets in the Antarctic Sky. II. 116 Transiting Exoplanet Candidates Found by AST3-II (CHESPA) within the Southern CVZ of TESS

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