Yunyang Li Curriculum Vitae/Jan

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Yunyang Li Curriculum Vitae/Jan. 2019 CONTACT INFORMATION Department of Physics & Astronomy ! pages.jh.edu/~yli311 Johns Hopkins University Ó [email protected] Bloomberg Hall 229 443.924.8718 3400 N. Charles St. , 0000-0002-4820-1122 Baltimore, MD, 21218 github.com/LiYunyang EDUCATION Johns Hopkins University, Baltimore, MD (2018-) Ph.D. student, Dept. of Physics & Astronomy University of Michigan, Ann Arbor, MI (2016, 2018) Visiting Scholar Peking University, Beijing, China (2013-2017) B.S., School of Physics, GPA: 3.8/4.0 REFERENCES Tobias Marriage | Associate professor | [email protected] Johns Hopkins University Renxin Xu | Professor | [email protected] Peking University Joel Bregman | H.D. Curtis professor | [email protected] University of Michigan, Ann Arbor COLLABORATIONS Cosmology Large Angular Scale Surveyor (CLASS) member, 2018- Hot Universe Baryon Surveyor (HUBS) member, 2018- SELECTED AWARDS 1st Prize, Pulsar Astrophysics Workshop National Astronomical Observatories, CAS, 2017 May-the-Fourth Scholarship Peking University, 2016 Visiting Scholarship China Scholarship Council, 2016 1st Prize, Academic Excellence Award of the Year Peking University, 2016 1st Prize, Social Work Award of the Year Peking University, 2014 Mizuho Bank Scholarship The Affiliated High School of Peking University, 2013 PUBLIC OUTREACH Supporting education in Astronomy and Physics Tangnan Second Middle School, Jiangxi, 2014 TALKS & PRESENTATIONS The properties of the Galactic hot gaseous halo from X-ray emission AAS 231, DC, 01/2018 Is Calvera a strangeon star? AAS 231, DC, 01/2018 The hot gaseous halo of the Milky Way including radiative transfer effects AAS 229, TX, 01/2017 TECHNICAL STRENGTHS programming tools python, C/C++, Mathematica, Julia, applescript, javascript, Fortran softwares XSPEC, Chandra CIAO, XMM-Newton SAS software development ADSTool (command-line tool for NASA-ADS) AstroToday (astro-ph push service) 1 PUBLICATIONS , h-index=3, 36 citations AS FIRST AUTHOR 2. Calvera: a low-mass strangeon star torqued by debris disk? Li, Y., Wang, W., Ge, M., Liu, X., Tong, H., Xu, R. Astrophysical Journal, 854, 165 (2018) 1. The properties of the Galactic hot gaseous halo from X-ray emission Li, Y., Bregman, J. Astrophysical Journal, 849, 105 (2017) AS CO-AUTHOR 3. The extended distribution of baryons around galaxies Bregman, J., Anderson, M., Miller, M., Hodges-Kluck, E., Dai, X., Li, J., Li, Y., Qu, Z. Astrophysical Journal, 862, 003 (2018) 2. Merging strangeon stars Lai, X., Yu, Y., Zhou, E., Li, Y., Xu, R. Research in Astronomy and Astrophysics, 18, 024 (2018) 1. The optical/UV excess of X-ray-dim isolated neutron star II. nonuniformity of plasma on strangeon star surface Wang, W., Feng, Y., Lai, X., Li, Y., Lu, J., Chen, X., Xu, R. Research in Astronomy and Astrophysics, 18, 082 (2018) 2 | YL.

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Deep Optical Observations of Unusual Neutron Star Calvera with The
to appear in The Astrophysical Journal Deep optical observations of unusual neutron star Calvera with the GTC† Yury Shibanov1,2, Andrey Danilenko1, Sergey Zharikov3, Peter Shternin1, Dima Zyuzin1 ABSTRACT Calvera is an unusual isolated neutron star with pure thermal X-ray spectrum typical for central compact objects in supernova remnants. On the other hand, its rotation period and spin-down rate are typical for ordinary rotation-powered pulsars. It was discovered and studied in X-rays and not yet detected in other spectral domains. We present deep optical imaging of the Calvera ﬁeld obtained with the Gran Telescopio Canarias in g′ and i′ bands. Within ≈ 1′′ vicinity of Calvera, we detected two point-like objects invisible at previous shallow observations. However, accurate astrometry showed that none of them can be identiﬁed with the pulsar. We put new upper limits on its optical brightness of g′ > 27.87 and i′ > 26.84. We also reanalyzed all available archival X-ray data on Calvera. Comparison of the Calvera thermal emission parameters and upper limits on optical and non-thermal X-ray emission with respective data on rotation- powered pulsars shows that Calvera might belong to the class of ordinary middle-aged pulsars, if we assume that its distance is in the range of 1.5–5 kpc. Subject headings: stars: neutron – pulsars: general – pulsars: individual: Calvera, 1RXS J141256.0+792204, PSR J1412+7922 1. Introduction High Galactic latitude, b ≈ +37◦, compact source 1RXS J141256.0+792204 in the ROSAT All-Sky Survey was proposed as a neutron star (NS) candidate by Rutledge et al.
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PDF of This Talk
DiscoveringDiscovering X-rayX-ray BrightBright NeutronNeutron StarsStars forfor CurrentCurrent andand Next-GenerationNext-Generation ObservatoriesObservatories DerekDerek B.B. FoxFox AstronomyAstronomy && AstrophysicsAstrophysics PennPenn StateState UniversityUniversity Chandra X – Boston – 24 September 2009 Isolated Neutron Stars • “Isolated neutron stars” – Blackbody spectrum (dominant) – Peak in far-UV / soft X- ray – Cooling age < 1 Myr – Minimal X-ray variability – Not radio pulsars – No binary companions – No supernova remnant • Optically faint – most extreme fX/fopt objects known • Identified as ROSAT All- Sky Survey (Bright Source Catalog) X-ray sources without optical counterpart The Magnificent Seven • Seven isolated neutron stars discovered over 1996– 2001 • All BSC sources – Serendipity – Targeted survey work (RBS) – Positions refined with HRI • Intriguing targets for detailed study – X-ray bright – Nearby (two with parallax) – Atmospheres amenable to modeling • Ultimate goals: – Measure masses and radii – Constrain nuclear equation of state – Investigate possibility of persistent GW emission RXS J1856.5-3754 • Discovered by Fred Walter • Bright X-ray source in front of the Corona Australis molecular cloud • Must be close → Low luminosity • Optical counterpart discovered with HST (V=25.6 mag) • X-ray to optical flux ratio confirms neutron star nature • Subsequent HST programs to measure parallax and proper Ho et al. 2006 motion • Distance: ~160 pc • Featureless spectrum, modeled as magnetic hydrogen atmosphere • Slow X-ray
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CONSTELLATION / GALAXIE POLARIS CONDENSED UPPERCASE ROMANS 170PT ZUNYI 150PT YUMEN 135PT VILLAGE XYLOMA 120PT WAXWING 105PT VESTMENTS WWW.VLLG.COM 1 CONSTELLATION / GALAXIE POLARIS CONDENSED UPPERCASE ITALICS 170PT ULTRA 150PT TRITON 135PT VILLAGE SIGLARE 120PT REEDBIRD 105PT QUANTITATE WWW.VLLG.COM 2 CONSTELLATION / GALAXIE POLARIS CONDENSED LOWERCASE ROMANS 170PT power 150PT oxnard 135PT VILLAGE numeric 120PT multipath 105PT lineamental WWW.VLLG.COM 3 CONSTELLATION / GALAXIE POLARIS CONDENSED LOWERCASE ITALICS 170PT kotow 150PT journal 135PT VILLAGE idoneity 120PT headlines 105PT grecianized WWW.VLLG.COM 4 CONSTELLATION / GALAXIE POLARIS CONDENSED ALL WEIGHTS & STYLES HEAVY & HEAVY ITALIC 30PT ADALINE BERMED catalyst debated BOLD & BOLD ITALIC 30PT EDIFIERS FIRMURA glabrous heliozoic MEDIUM & MEDIUM ITALIC 30PT IMMENSE JETSOMS VILLAGE klaxoned longueuil BOOK & BOOK ITALIC 30PT MATRICES NOSHERIE odalisque phonetist LIGHT & LIGHT ITALIC 30PT QUALTAGH RINGSIDER sentiment trekschuit WWW.VLLG.COM 5 CONSTELLATION / GALAXIE POLARIS CONDENSED SAMPLE TEXT SETTINGS BOLD & BOLD ITALIC 14PT Polaris, designated Ursae Minoris (Latinized to Alpha Ursae Minoris, abbreviated A lpha UMi), commonly the North Star or Pole Star, is the brightest star in the conste llation of Ursa Minor. It is very close to the north celestial pole, making it the curre nt northern pole star. The revised Hipparcos parallax gives a distance to Polaris of about 433 light-years, while calculations by other methods derive distances arou nd 30% closer. Polaris is a triple star system, composed of the primary star, Polar is Aa, in orbit with a smaller companion (Polaris Ab); the pair in orbit with Polaris B (discovered in August 1779 by William Herschel). There were once thought to be tw o more distant components—Polaris C and Polaris D—but these have been sho wn not to be physically associated with the Polaris system.
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