other Galactic science Jane Greaves St Andrews

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Esmond Curtis Heath
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1 other Galactic science Jane Greaves St Andrews

2 JCMT examples Sgr A*: massive black hole Evolved stars: dust and molecules Shell stars: violent mass-loss Shaping PNe: breaking spherical symmetry Pulsars: do planets re-form? Circumstellar discs: birth of planets Kuiper Belt Objects: surfaces, atmospheres Comets: chemistry Saturn & Jupiter: impacts & chemical enrichment Mars: monitoring the weather Lunar surface: from eclipses Chromospheres: probing stars and the Sun

3 Sgr A* JCMT continuum, polarization, Event Horizon Telescope how is the black hole fed? what happens at a few R Schwarzschild? Garcia-Marin et al 2011; Aitken et al. 2000

4 evolved stars JCMT continuum imaging, line surveys origins of dust in the Galaxy (AGB? SNe?) tests of nucleosynthesis and mass-loss in stellar winds Gomez et al. 2007; Morgan et al. 2003; Ramstedt et al. 2008

5 detached shell stars JCMT imaging in lines and continuum brief but violent mass-loss from giant stars: originates from thermal pulses? surveyed with Herschel (right) small amounts of JCMT archival data tracing cold dust and CO molecules Kerschbaum et al. 2010

6 shaping planetary nebulae JCMT continuum imaging and polarimetry unclear why post-main sequence stars can diverge from spherical symmetry wind may be shaped by close companions, or by magnetic fields? Sabin et al. 2007

7 pulsars JCMT high-frequency continuum imaging origins of planets around (rare!) pulsars: SNe fallback discs or sweeping of the ISM? Greaves et al., in prep Contour: pulsar wind nebula in X-rays Colour: mid-infrared nebula Cross: 450 micron detection towards pulsar (DDT observations with SCUBA and SCUBA-2)

8 discs around young stellar objects JCMT wide-field continuum imaging complete and uniform surveys of discs around young stars when does dust stick together, starting the process of planet formation? Buckle et al., in prep

9 Kuiper Belt Objects JCMT continuum (monitoring, deep photometry) + lines late-time discs of debris require large planetesimals to be present what do we learn from these bodies in the Solar System? Greaves et al. 2011, 2014

10 comet chemistry JCMT line surveys & imaging why are comets so chemically varied? how do they out-gas? what happens as they break up? HCN in comet Hale-Bopp coma: Jewitt et al. 1997

11 planet impacts JCMT spectral monitoring how have comet impacts affected the atmospheric chemistry of Jupiter & Saturn? are some species completely external? Jupiter in HCN: Moreno et al Saturn in CO: Cavalie et al. 2010

12 planetary weather JCMT spectral monitoring e.g. wind patterns and thermal changes on Mars Clancy et al. 2006

13 the lunar surface JCMT poor-weather continuum imaging map the temperatures in the lunar regolith (a few cm into the crust) can e.g. see how it cools during a lunar eclipse Jessop et al. (SCUBA) Zozubal et al. (SCUBA-2)

14 solar & stellar structure JCMT continuum temperature minimum of stars occurs between the photosphere and chromosphere so far only measured for the Sun and alpha Cen A Liseau et al 2013, Spitzer, Herschel, APEX

15 possibilities! JCMT can look into questions in many science areas (solar system, stars, stellar remnants, exoplanets ), engaging much of the astronomy community JCMT s wide range of instruments and observing modes enables clever idea tests (leading to follow-up with other facilities) small programmes now can lead to future large surveys (as happened with debris discs, high-z galaxies )

Introduction The Role of Astronomy p. 3 Astronomical Objects of Research p. 4 The Scale of the Universe p. 7 Spherical Astronomy Spherical

Introduction The Role of Astronomy p. 3 Astronomical Objects of Research p. 4 The Scale of the Universe p. 7 Spherical Astronomy Spherical Trigonometry p. 9 The Earth p. 12 The Celestial Sphere p. 14 The