Prof. Ip: "A tadpole's metamorphosis"

時間/地點: 2020-11-11 12:10 [S4-1013]



We present new Atacama Large Millimeter/submillimeter Array observations of the tadpole, a small globule in the Carina Nebula that hosts the HH 900 jet+outflow system. Our data include 12CO, 13CO, C18O J=2–1, 13CO, C18O J=3–2, and serendipitous detections of DCN J=3–2 and CS J=7–6. With angular resolution comparable to the Hubble Space Telescope, our data reveal for the first time the bipolar molecular outflow in CO, seen only inside the globule, that is launched from the previously unseen jet-driving protostar (the HH 900 YSO). The biconical morphology joins smoothly with the externally irradiated outflow seen in ionized gas tracers outside the globule, tracing the overall morphology of a jet-driven molecular outflow. Continuum emission at the location of the HH 900 YSO appears to be slightly flattened perpendicular to outflow axis. Model fits to the continuum have a best-fitting spectral index of ~ 2, suggesting cold dust and the onset of grain growth. In position–velocity space, 13CO and C18O gas kinematics trace a C-shaped morphology, similar to infall profiles seen in other sources, although the global dynamical behaviour of the gas remains unclear. Line profiles of the CO isotopologues display features consistent with externally heated gas. We estimate a globule mass of ~ 1.9 M, indicating a remaining lifetime of ~ 4 Myr, assuming a constant photoevaporation rate. This long globule lifetime will shield the disc from external irradiation perhaps prolonging its life and enabling planet formation in regions where discs are typically rapidly destroyed.

You may refer to the following link for more details:


2020-11-11Prof. IpA tadpole's metamorphosis
2020-10-28Dr. Ying LiaoSublimation as an effective mechanism for flattened lobes of (486958) Arrokoth
2020-10-21Prof. NgeowThe value of the Hubble-Lemaître constant queried by Type Ia Supernovae: A journey from the Calán-Tololo Project to the Carnegie Supernova Program
2019-12-19Prof. Chen Wen-PingAnnual Review of Astronomy and Astrophysics 2019
2019-12-05Dr. Kinoshita DaisukeMy plan for coming winter vacation - observations of comet 289P/Blanpain
2019-11-28Dr. Zhong-Yi Lin Comets and Interstellar objects
2019-11-21Dr. Chow-Choong NgeowHow to Write A (Good) LOT Proposal
2019-10-17Prof. Ip Wing-HuenTen Easy Pieces
2019-10-03Dr. Hwang Chorng-YuanConfirmation of Planet-Mass Objects in Extragalactic Systems
2018-12-24Prof. Chorng-Yuan HwangGalaxy cluster mergers as triggers for the formation of jellyfish galaxies: case study of the A901/2 system
2018-12-17Prof. Wen-Ping ChenCould Solar Radiation Pressure Explain ‘Oumuamua’s Peculiar Acceleration?
2018-12-10Chia-Lung LinDetecting Water in the Atmosphere of HR 8799 c with L-band High-dispersion Spectroscopy Aided by Adaptive Optics
2018-11-26Dr. Chiende LeeVelocity-resolved [O I] 63 μm Emission in the HD 50138 Circumstellar Disk
2018-11-19Dr. Yong TianUltra Diffuse Galaxy NGC1052–DF2 lacking Dark Matter?
2018-06-13Dr. Ngeow, Chow-ChoongGaia Data Release 2: Observational Hertzsprung-Russell diagrams
2018-06-06Professor Chung-Ming KoSignal coverage approach to the detection probability of hypothetical extraterrestrial emitters in the Milky Way
2018-05-30Nai-Hui LiaoThe expected spins of gravitational wave sources with isolated field binary progenitors
2018-05-16Jia-Yu OuMira Variable Stars from LAMOST DR4 Data: Emission Features, Temperature Types, and Candidate Selection
2018-05-02Dr. Daisuke KinoshitaDome C ultracarbonaceous Antarctic micrometeorites. Infrared and Raman fingerprints
2018-04-25Po-Chieh YuA density cusp of quiescent X-ray binaries in the central parsec of the Galaxy
2018-04-11Han Zheng 鄭翰Unveiling the Origin of the Fermi Bubbles
2018-03-28Tsan-Ming Wang 王贊銘Metal Deficiency in Two Massive Dead Galaxies at z ~ 2
2018-01-09Dr. Chan-Kao ChangA binary main-belt comet
2017-11-28Bhavana LalchandA brief visit from a red and extremely elongated interstellar asteroid
2017-11-21Prof. Yi ChouThe Neutron star Interior Composition ExploreR (NICER): an Explorer mission of opportunity for soft x-ray timing spectroscopy
2017-11-14Prof. Chow-Choong NgeowHunting the Optical Counterparts for Gravitational Wave Events
2017-10-31Chia-Hsiang Huang The mean star formation rates of unobscured QSOs: searching for evidence of suppressed or enhanced star formation
2017-10-24Prof. Wing-Huen IpIlluminating gravitational waves: A concordant picture of photons from a neutron star merger
2017-10-17Prof. Chorng-Yuan HwangHow large are the globular cluster systems of early-type galaxies and do they scale with galaxy halo properties?
2017-10-03Prof. Wen-Ping ChenAnnual Review of Astronomy and Astrophysics 2017
2017-06-08Hung-En HsienDiscovery of a soft X-ray 8 mHz QPO from the accreting millisecond pulsar IGR J00291+5934
2017-06-01Yi-Hao SuMaking Your Astronomy Research Code Citable
2017-05-11Dr. Daisuke KinoshitaThe Splitting of Double-component Active Asteroid P/2016 J1 (PANSTARRS)
2017-04-20Prof. Wen-Ping ChenSpiral density waves in a young protoplanetary disk
2017-04-06Jen-Chao HuangHiding in Plain Sight - Recovering Clusters of Galaxies with the Strongest AGN in Their Cores Tucanae
2017-03-30Prof. Wing-Huen IpRepeating fast radio bursts from highly magnetized pulsars traveling through asteroid belts
2017-02-16Dr. Chien-De LeeAn intermediate-mass black hole in the centre of the globular cluster 47 Tucanae
2016-12-15Dr. Yu-Chi ChengDiscovery of a New Retrograde Trans-Neptunian Object: Hint of a Common Orbital Plane for Low Semimajor Axis, High-inclination TNOs and Centaurs
2016-12-08Prof. Yi ChouDiscovery of a new accreting millisecond X-ray pulsar in the globular cluster NGC 2808
2016-11-24Hsing-Wen LinConsequences of a Distant Massive Planet on the Large Semi-major Axis Trans-Neptunian Objects
2016-10-20Po-Shih ChiangSpiral density waves in a young protoplanetary disk
2016-10-13Chien-De LeePan-STARRS and PESSTO search for an optical counterpart to the LIGO gravitational-wave source GW150914
2016-05-26Jen-Chao HuangRadio continuum detection in blue early-type weak emission line galaxies
2016-05-12Dr. Chan-Kao ChangA 2 km-size asteroid challenging the rubble-pile spin barrier - A case for cohesion
2016-04-28 Manash Ranjan SamalEpisodic molecular outflow in the very young protostellar cluster Serpens South
2016-04-21Po-Chieh YuALMA resolves the torus of NGC 1068: continuum and molecular line emission
2016-04-07Prof. Wen-Ping ChenWISEA J114724.10-204021.3: A Free-Floating Planetary Mass Member of the TW Hya Association
2016-03-10Chien-De LeeProperties of the binary black hole merger GW150914
2016-02-25Po-Shih Chiang 姜博識An all-sky Support Vector Machine selection of WISE YSO Candidates.
2015-12-31Prof. Yi Chou 周翊A possible cyclotron resonance scattering feature near 0.7 keV in X1822-371
2015-12-10Yong Tian 田雍Statistical Method on Astrophysics – Local Regression Method
2015-11-26Daisuke Kinoshita 木下大輔Observations of “fresh” and weathered surfaces on asteroid pairs and their implications on the rotational-fission mechanism
2015-10-29Yu-Chi Cheng 鄭宇棋The NEOWISE-Discovered Comet Population and the CO+CO2 production rates
2015-10-08Po-Shih Chiang 姜博識Discovery and spectroscopy of the young Jovian planet 51 Eri b with the Gemini Planet Imager
2015-10-01Hsing-Wen Lin 林省文Space Weathering Trends Among Carbonaceous Asteroids
2015-05-29Daisuke Kinoshita 木下大輔Spectral properties of the largest asteroids associated with Taurid Complex
2015-05-14Chan-Kao Chang 章展誥29 November 2011 stellar occultation by 2060 Chiron: Symmetric jet-like features
2015-04-30I-Ling Lin 林怡伶Ongoing hydrothermal activities within Enceladus
2015-04-09Dr. Hsing-Wen Lin 林省文Planet heating prevents inward migration of planetary cores
2015-03-19Yong Tian 田雍Dynamics of Elliptical Galaxies with Planetary Nebulae in the MOdified Newtonian Dynamics
2015-01-08Yi-Hao Su 蘇羿豪Practices in source code sharing in astrophysics
2014-12-25I-Ling Lin 林怡伶The Secret Lives of Cepheids: Evolutionary Changes and Pulsation-Induced Shock Heating in the Prototype Classical Cepheid δ Cep
2014-12-18I-Chenn Chen 陳以忱J1649+26: A Grand-Design Spiral with a Large Double-Lobed Radio Source
2014-12-04Ting-Chang Yang 楊庭彰SDSS J001153.08-064739.2, a Cataclysmic Variable with an Evolved Donor in the Period Gap
2014-11-27Li-Ching Huang 黃立晴Kepler Flares I. Active and Inactive M dwarfs
2014-11-06Chien-De Lee 李建德How tiny galaxies form stars
2014-10-30Jen-Chao Huang 黃仁昭Relics of Galaxy Merging: Observational Predictions for a Wandering Massive Black Hole and Accompanying Star Cluster in the Halo of M31
2014-10-16Yu-Chi Cheng 鄭宇棋Dust environment and dynamical history of a sample of short-period comets
2014-10-09Zong-Fu Sie 謝宗富The host galaxy and late-time evolution of the Super-Luminous Supernova PTF12dam
2014-10-02Po-Shin Chiang 姜博識Gender-based Systematics in HST Proposal Selection
2014-06-05Yi-Hao SuBlack hole spin measurements through the relativistic precession model: XTE J1550-564
2014-05-29Po-Chieh YuNASA's WISE Findings Poke Hole in Black Hole 'Doughnut' Theory
2014-05-15An-Li TsaiSuppression of star formation in the galaxy NGC 253 by a starburst-driven molecular wind
2014-05-08Chan-Kao ChangA ring system detected around the Centaur (10199) Chariklo
2014-05-01Ching-Ping LinFound: the progenitors of AM CVn and supernovae .Ia
2014-04-24Ting-Chang YangA millisecond pulsar in a stellar triple system
2014-03-27Hsing-Wen LinDark Matter as a trigger for Periodic Comet Impacts
2014-03-20Zhong-Yi LinThe water production rate of Rosetta target Comet 67P/Churyumov-Gerasimenko near perihelion in 1996, 2002 and 2009 from Lyman α observations with SWAN/SOHO
2014-03-13Daisuke KinoshitaThe internal structure of asteroid (25143) Itokawa as revealed by detection of YORP spin-up
2014-03-06Po-Shih ChiangA global cloud map of the nearest known brown dwarf
2014-01-02Yi ChouSwings between rotation and accretion power in a binary millisecond pulsar
2013-12-26Chien-Cheng LinEvaluating Gyrochronology on the Zero-Age-Main-Sequence: Rotation Periods in the Southern Open Cluster Blanco 1 from the KELT-South Survey
2013-12-12I-Chenn ChenStar formation and AGN activity in interacting galaxies: a near-UV perspective
2013-12-05Chin-Ping HuA long-term X-ray monitoring of the ultraluminous X-ray source NGC 5408 X-1 with Swift reveals the presence of dips but no orbital period
2013-11-28Li-Ching HuangA rocky composition for an Earth-sized exoplanet
2013-11-28Lin TuA high-amplitude thermal inertia anomaly of probable magnetospheric origin on Saturn’s moon Mimas
2013-10-31Wen-Ping ChenA SCUBA-2 850-μm survey of protoplanetary discs in the σ Orionis cluster
2013-10-24Jen-Chao HuangA high Eddington-ratio, true Seyfert 2 galaxy candidate: implications for broad-line region models
2013-10-03Chandler LeeA study of Be stars in the Magellanic Clouds
2013-09-25Prof. Wing-Huen IpIn Situ Observations of Interstellar Plasma With Voyager 1