Cherenkov telescopes as optical telescopes for bright sources: today's specialized 30-m telescopes?

Imaging Atmospheric Cherenkov Telescopes (IACTs) use large-aperture (3–30 m) optical telescopes with arcminute angular resolution to detect TeV gamma-rays in the atmosphere. I show that IACTs are well suited for optical observations of bright sources (V≲ 8–10), because these sources are brighter than the sky background. Their advantages are especially great on rapid time-scales. Thus, IACTs might study many phenomena optically, including transiting exoplanets and the brightest gamma-ray bursts. In principle, an IACT could achieve millimagnitude photometry of these objects with second-long exposures. I also consider the potential for optical spectroscopy with IACTs, finding that their poor angular resolution limits their usefulness for high spectral resolutions, unless complex instruments are developed. The high photon collection rate of IACTs is potentially useful for precise polarimetry. Finally, I briefly discuss the broader possibilities of extremely large, low-resolution telescopes, including a 10 arcsec resolution telescope and space-borne telescopes.

[1]  C. Alard.  Image subtraction using a space-varying kernel , 2000 .

[2]  Eli Waxman,et al.  Gamma-ray burst afterglow: Polarization and analytic light curves , 1999 .

[3]  J. Hough,et al.  The linear polarization of nearby bright stars measured at the parts per million level , 2010, 1003.1753.

[4]  Andrew T. Young,et al.  Photometric error analysis. VI. Confirmation of Reiger's theory of scintillation , 1967 .

[5]  Andrew Gould,et al.  Using All-Sky Surveys to Find Planetary Transits , 2002 .

[6]  Sloane J. Wiktorowicz,et al.  NONDETECTION OF POLARIZED, SCATTERED LIGHT FROM THE HD 189733b HOT JUPITER , 2009, 0902.0624.

[7]  M. Cropper,et al.  High-speed, energy-resolved STJ observations of the AM Her system V2301 Oph , 2005, astro-ph/0502038.

[8]  Tel Aviv,et al.  Beaming Binaries: A New Observational Category of Photometric Binary Stars , 2007, 0708.2100.

[9]  D. Buscher,et al.  Interferometric seeing measurements at the La Palma Observatory , 1991 .

[10]  V. S. Dhillon,et al.  ULTRACAM: an ultrafast, triple-beam CCD camera for high-speed astrophysics , 2007 .

[11]  D. Renker.  New trends on photodetectors , 2007 .

[12]  Dieter Renker,et al.  First detection of Cherenkov light from cosmic-particle-induced air showers by Geiger-mode avalanche photodiodes , 2007 .

[13]  K. Stanek,et al.  Disparate MG II absorption statistics towards quasars and gamma-ray bursts: a possible explanation , 2006, astro-ph/0605676.

[14]  B. A. McLeod,et al.  Pushing the Limits of Ground-based Photometric Precision: Submillimagnitude Time-Series Photometry of the Open Cluster NGC 6791 , 2005, astro-ph/0504487.

[15]  J. Bahcall,et al.  Models for the Galaxy and the Predicted Star Counts , 1979 .

[16]  R. H. Brown,et al.  The Stellar Interferometer at Narrabri Observatory—I: A Description of The Instrument and the Observational Procedure , 1967 .

[17]  G. Beskin,et al.  Optical search for extraterrestrial intelligence with Air Cerenkov telescopes. , 2001, Astrobiology.

[18]  H. Krawczynski,et al.  The optical system of the H.E.S.S. imaging atmospheric Cherenkov telescopes. Part II: mirror alignment and point spread function , 2003 .

[19]  E. Meurs,et al.  Non variability of intervening absorbers observed in the UVES spectra of the "naked-eye" GRB080319 , 2009, 0906.3191.

[20]  Kevin Krisciunas,et al.  A MODEL OF THE BRIGHTNESS OF MOONLIGHT , 1991 .

[21]  D. Renker,et al.  First Avalanche-photodiode camera test (FACT): A novel camera using G-APDs for the observation of very high-energy γ-rays with Cherenkov telescopes , 2009 .

[22]  P. J. Wheatley,et al.  High-precision photometry by telescope defocussing. I. The transiting planetary system WASP-5 , 2009, 0903.2139.

[23]  M. Moncuquet,et al.  A Detection Method for Small Kuiper Belt Objects: The Search for Stellar Occultations , 2000 .

[24]  S. Seager,et al.  PHOTOMETRIC LIGHT CURVES AND POLARIZATION OF CLOSE-IN EXTRASOLAR GIANT PLANETS , 2000 .

[25]  A. C. Carciofi,et al.  The Polarization Signature of Extrasolar Planet Transiting Cool Dwarfs , 2005, astro-ph/0508343.

[26]  J. Holder,et al.  Optical Intensity Interferometry with Atmospheric Cerenkov Telescope Arrays , 2006, astro-ph/0608305.

[27]  David Charbonneau,et al.  Detection of Thermal Emission from an Extrasolar Planet , 2005 .

[28]  E. Borra.  A Novel Technique to Observe Rapidly Pulsating Objects using Spectral Wave-interaction Effects , 2010, 1004.4918.

[29]  M. Holman,et al.  The Transit Light Curve Project. III. Tres Transits of TrES-1 , 2006, astro-ph/0611404.

[30]  C. Akerlof,et al.  GAMMA-RAY ASTRONOMY WITH IMAGING ATMOSPHERIC ČERENKOV TELESCOPES , 1997 .

[31]  Lennart Lindegren,et al.  ATMOSPHERIC INTENSITY SCINTILLATION OF STARS, I. STATISTICAL DISTRIBUTIONS AND TEMPORAL PROPERTIES , 1997 .

[32]  Motohide Tamura,et al.  PlanetPol: A Very High Sensitivity Polarimeter , 2006 .

[33]  Christian Erd,et al.  Absolute timing of the Crab Pulsar at optical wavelengths with superconducting tunneling junctions , 2006 .

[34]  Heidelberg,et al.  Capability of Cherenkov Telescopes to Observe Ultra-fast Optical Flares , 2008, 0812.3966.

[35]  E. Figueroa-Feliciano,et al.  First astronomical application of a cryogenic transition edge sensor spectrophotometer , 1999 .

[36]  M. Doro,et al.  CTA - A Project for a New Generation of Cherenkov Telescopes , 2009, 0908.1410.

[37]  John M. Martinis,et al.  Phase-resolved Crab Studies with a Cryogenic Transition-Edge Sensor Spectrophotometer , 2001, astro-ph/0108240.

[38]  D. Lewis.  Optical characteristics of the whipple observatory TeV gamma-ray imaging telescope , 1990 .

[39]  E. Lorenz,et al.  Status of the 17 m ∅ MAGIC telescope , 2004 .

[40]  F. Goebel,et al.  The central pixel of the MAGIC telescope for optical observations , 2006 .

[41]  T. Weekes,et al.  The Whipple Observatory 10 m gamma-ray telescope, 1997-2006 , 2007 .

[42]  E. Ofek,et al.  A single sub-kilometre Kuiper belt object from a stellar occultation in archival data , 2009, Nature.

[43]  E. Agol,et al.  On detecting terrestrial planets with timing of giant planet transits , 2004 .

[44]  Matthew J. Holman,et al.  The Use of Transit Timing to Detect Terrestrial-Mass Extrasolar Planets , 2005, Science.

[45]  W. Hofmann,et al.  Measurement of the Cherenkov light spectrum and of the polarization with the HEGRA IACT system , 2001 .

[46]  Felix Aharonian,et al.  High energy astrophysics with ground-based gamma ray detectors , 2008 .

[47]  Stuart Bowyer,et al.  The 1997 reference of diffuse night sky brightness , 1998 .

[48]  B. Gaudi,et al.  DETECTING TRANSITS OF PLANETARY COMPANIONS TO GIANT STARS , 2009, 0902.4237.

[49]  M. Bessell.  Standard Photometric Systems , 2005 .

[50]  E. Kerins,et al.  Difference image photometry with bright variable backgrounds , 2010, 1004.2166.

[51]  W. Lustermann,et al.  FACT -- the First Cherenkov Telescope using a G-APD Camera for TeV Gamma-ray Astronomy (HEAD 2010) , 2010, 1010.2397.

[52]  R. Mirzoyan,et al.  A 15° wide field of view imaging air Cherenkov telescope , 2008, 0806.0297.

[53]  F. Grupp,et al.  VIRUS: A hugely replicated integral field spectrograph for HETDEX , 2006 .

[54]  Aaron Golden,et al.  Catching the light curve of flaring GRBs: The opportunity offered by scanning telescopes , 1999 .

[55]  José Salgado,et al.  Nuclear Instruments and Methods , 2003 .

[56]  M. Holman,et al.  THE TRANSIT LIGHT CURVE PROJECT. XI. SUBMILLIMAGNITUDE PHOTOMETRY OF TWO TRANSITS OF THE BLOATED PLANET WASP-4b , 2009, 0901.4346.

[57]  R. Ong,et al.  Very high-energy gamma-ray astronomy , 1998 .

[58]  T. Grav,et al.  The Strongly Polarized Afterglow of GRB 020405 , 2002, astro-ph/0206465.

[59]  R. Gilliland,et al.  Detection of an Extrasolar Planet Atmosphere , 2001, astro-ph/0111544.

[60]  D. Renker,et al.  A novel camera type for very high energy gamma-ray astronomy based on Geiger-mode avalanche photodiodes , 2009, 0911.4920.

[61]  V. Golev,et al.  Design concepts for the Cherenkov Telescope Array CTA: an advanced facility for ground-based high-energy gamma-ray astronomy , 2011 .

[62]  R. P. Butler,et al.  A Transiting “51 Peg-like” Planet , 2000, The Astrophysical journal.

[63]  J. A. Hinton,et al.  Precision measurement of optical pulsation using a Cherenkov telescope , 2006 .

[64]  J. A. Hinton,et al.  The status of the HESS project , 2004 .

[65]  S. V. Berdyugina,et al.  First Detection of Polarized Scattered Light from an Exoplanetary Atmosphere , 2007, 0712.0193.

[66]  H. Krawczynski,et al.  The optical system of the H.E.S.S. imaging atmospheric Cherenkov telescopes. Part I: layout and components of the system , 2003, astro-ph/0308246.

[67]  T. Humensky.  Status of VERITAS , 2005 .

[68]  L. A. Filatov,et al.  Silicon photomultiplier and its possible applications , 2003 .

[69]  M. Shao,et al.  Atmospheric phase measurements with the Mark III stellar interferometer. , 1987, Applied optics.

[70]  D. L. Starr,et al.  OBSERVATIONS OF THE NAKED-EYE GRB 080319B: IMPLICATIONS OF NATURE'S BRIGHTEST EXPLOSION , 2008, 0803.3215.

[71]  B. Schaefer,et al.  Superflares on Ordinary Solar-Type Stars , 1999, astro-ph/9909188.

[72]  P. Verhoeve.  Photon Counting Low Temperature Detectors for Visible to Gamma Ray Astrophysics , 2008 .

[73]  B. Sicardy,et al.  Stellar occultations by small bodies - Diffraction effects , 1987 .

[74]  T. Brown.  Transmission Spectra as Diagnostics of Extrasolar Giant Planet Atmospheres , 2001, astro-ph/0101307.

[75]  Alessandro Monfardini,et al.  Early Optical Polarization of a Gamma-Ray Burst Afterglow , 2007, Science.

[76]  Steve B. Howell,et al.  A Technique for Ultrahigh‐Precision CCD Photometry , 2001 .

[77]  Gregory W. Henry.  Techniques for Automated High-Precision Photometry of Sun-like Stars , 1999 .

[78]  Orbital Perturbations of Transiting Planets: A Possible Method to Measure Stellar Quadrupoles and to Detect Earth-Mass Planets , 2001, astro-ph/0104034.

[79]  Lennart Lindegren,et al.  Atmospheric Intensity Scintillation of Stars. III. Effects for Different Telescope Apertures , 1998 .

[80]  Frederic Pont,et al.  The effect of red noise on planetary transit detection , 2006, astro-ph/0608597.

[81]  Sloane J. Wiktorowicz,et al.  A High-Precision Optical Polarimeter to Measure Inclinations of High-Mass X-Ray Binaries , 2007, 0810.5561.

[82]  Simon P. Swordy,et al.  VERITAS: the Very Energetic Radiation Imaging Telescope Array System , 1999 .

[83]  Anthony J. Peacock,et al.  S-Cam 3: Optical astronomy with a STJ-based imaging spectrophotometer , 2006 .

[84]  R. H. Brown,et al.  Results of a Southern-Hemisphere search for gamma-ray sources at energies of at least 300 GeV , 1975 .

[85]  A. Loeb,et al.  Periodic Flux Variability of Stars due to the Reflex Doppler Effect Induced by Planetary Companions , 2003, astro-ph/0303212.

[86]  S. V. Berdyugina,et al.  POLARIZED REFLECTED LIGHT FROM THE EXOPLANET HD189733b: FIRST MULTICOLOR OBSERVATIONS AND CONFIRMATION OF DETECTION , 2010, 1101.0059.

[87]  H. Kubo,et al.  The optical reflector system for the CANGAROO-II imaging atmospheric Cherenkov telescope , 2001 .

[88]  C. Copperwheat,et al.  A stellar flare during the transit of the extrasolar planet OGLE-TR-10b , 2009, 0908.2329.

[89]  B. McLeod,et al.  A SEARCH FOR OCCULTATIONS OF BRIGHT STARS BY SMALL KUIPER BELT OBJECTS USING MEGACAM ON THE MMT , 2009, 0903.3036.

[90]  M. López-Morales.  Millimagnitude‐Precision Photometry of Bright Stars with a 1 m Telescope and a Standard CCD , 2006, astro-ph/0601289.

[91]  Direct determination of quasar redshifts , 2001, astro-ph/0111476.

[92]  L. Hebb,et al.  Improved parameters for the transiting hot Jupiters WASP-4b and WASP-5b , 2008, 0812.1998.