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天文和天体物理学研究
天文和天体物理学研究

汪景琇 景益鹏

月刊

1674-4527

wenyy@bao.ac.cn

010-64853746

100717

北京朝阳区大屯路甲20号国家天文台 RAA编辑部

天文和天体物理学研究/Journal Research in Astronomy and AstrophysicsCSCD北大核心CSTPCDSCI
查看更多>>本刊1981年创刊至2000年已出版20卷。创刊时为中文期刊，2001年改为《中国天文和天体物理学报》（英文版）。主要刊登天文学和天体物理学领域的原创性研究论文。主要栏目和报道范围：“研究快报”用来报道天文观测的新结果及新理论；“特约综述”聘请国际知名天文学家就某些热点问题进行专题评述。“研究论文”具有原创性。2009年更名为《天文和天体物理学研究》（英文版），由双月刊变为月刊。
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    Optical Transient Source AT20211fa:A Possible"Dirty Fireball"

    Xue-Mei YeDa-Ming WeiYi-Ming ZhuZhi-Ping Jin...
    124-133页
    查看更多>>摘要：AT20211fa,also known as ZTF21aayokph,was detected by the Zwicky Transient Facility on 2021 May 4,at 05:34:48 UTC.Follow-up observations were conducted using a range of ground-based optical telescopes,as well as Swift/XRT and VLA instruments.AT20211fa is classified as an"orphan afterglow"candidate due to its rapid flux decline and its reddened color(g-r=0.17±0.14 mag).For an optical transient source without prompt gamma-ray detection,one key point is to determine its burst time.Here we measure the burst time through fitting the initial bump feature of AT20211fa and obtain its burst time as 2021 May 3,at 22:09:50 UTC.Using afterglowpy,we model the multi-band afterglow of AT20211fa and find that the standard model cannot reproduce the late radio observations well.Considering that the microphysical parameters εe,εB(the energy fraction given to electrons and magnetic field),and ζN(the fraction of accelerated electrons)may vary with time,we then model the afterglow of AT20211fa taking into account the temporal evolution of the physical parametersεe,εB,and ζN and find in this case the multi-wavelength observations can be reproduced well.The initial Lorentz factor of AT20211fa can be estimated from the peak time of the early afterglow,which yields a value of about 18,suggesting that AT20211fa should be classified as a"dirty fireball."From the upper limit for the prompt emission energy of AT20211fa,we obtain that the radiation efficiency is less than 0.02％,which is much smaller than that of ordinary gamma-ray bursts(GRBs).It is also interesting that the fitted values of jet angle and viewing angle are very large,θc～0.66 rad,θv～0.53 rad,which may lead to the low Lorentz factor and radiation efficiency.When compared with GRB afterglow samples,it is evident that the onset bump timescale of AT20211fa satisfies the empirical relationships observed in GRB samples.Additionally,the luminosity of AT20211fa falls within the range of observations for GRB samples;however,approximately 1 day after the burst,its luminosity exceeds that of the majority of GRB samples.
      原文链接:
    • 万方数据

    Morphology Study for GeV Emission of Nearby Supernova Remnant G332.5-5.6

    Ming-Hong LuoQing-Wen TangXiu-Rong Mo
    134-140页
    查看更多>>摘要：A spatial template is important to study nearby supernova remnants(SNRs).For SNR G332.5-5.6,we report a Gaussian disk with a radius of about 1°.06 to be a potential good spatial model in the γ-ray band.Employing this new Gaussian disk,its GeV lightcurve shows a significant variability of about seven sigma.The γ-ray observations of this SNR could be explained well either by a leptonic model or a hadronic model,in which a flat spectrum for the ejected electrons/protons is required.
      原文链接:
    • 万方数据
    • 维普

    The Metallicity Dimension of the Super Earth-cold Jupiter Correlation

    祝伟
    141-146页
    查看更多>>摘要：The correlation between close-in super Earths and distant cold Jupiters in planetary systems has important implications for their formation and evolution.Contrary to some earlier findings,a recent study conducted by Bonomo et al.suggests that the occurrence of cold Jupiter companions is not excessive in super-Earth systems.Here we show that this discrepancy can be seen as a Simpson's paradox and is resolved once the metallicity dependence of the super-Earth-cold Jupiter relation is taken into account.A common feature is noticed that almost all the cold Jupiter detections with inner super-Earth companions are found around metal-rich stars.Focusing on the Sun-like hosts with super-solar metallicities,we show that the frequency of cold Jupiters conditioned on the presence of inner super Earths is 39+12-11％,whereas the frequency of cold Jupiters in the same metallicity range is no more than 20％.Therefore,the occurrences of close-in super Earths and distant cold Jupiters appear correlated around metal-rich hosts.The relation between the two types of planets remains unclear for stars with metal-poor hosts due to the limited sample size and the much lower occurrence rate of cold Jupiters,but a correlation between the two cannot be ruled out.
      原文链接:
    • 万方数据
    • 维普

    A Statistical Study of Magnetic Flux Emergence in Solar Active Regions Prior to Strongest Flares

    Alexander S.KutsenkoValentina I.AbramenkoAndrei A.Plotnikov
    147-160页
    查看更多>>摘要：Using the data on magnetic field maps and continuum intensity for Solar Cycles 23 and 24,we explored 100 active regions(ARs)that produced M5.0 or stronger flares.We focus on the presence/absence of the emergence of magnetic flux in these ARs 2-3 days before the strong flare onset.We found that 29 ARs in the sample emerged monotonically amidst quiet-Sun.A major emergence of a new magnetic flux within a pre-existing AR yielding the formation of a complex flare-productive configuration was observed in another 24 cases.For 30 ARs,an insignificant(in terms of the total magnetic flux of pre-existing AR)emergence of a new magnetic flux within the pre-existing magnetic configuration was observed;for some of them the emergence resulted in a formation of a configuration with a small δ-sunspot;11 out of 100 ARs exhibited no signatures of magnetic flux emergence during the entire interval of observation.In six cases the emergence was in progress when the AR appeared on the Eastern limb,so that the classification and timing of emergence were not possible.We conclude that the recent flux emergence is not a necessary and/or sufficient condition for strong flaring of an AR.The flux emergence rate of flare-productive ARs analyzed here was compared with that of flare-quiet ARs analyzed in our previous studies.We revealed that the flare-productive ARs tend to display faster emergence than the flare-quiet ones do.
      原文链接:
    • 万方数据
    • 维普

    On the Performances of Estimating Stellar Atmospheric Parameters from CSST Broad-band Photometry

    Rui-Feng ShiYang HuangXin-Yi LiHua-Wei Zhang...
    161-173页
    查看更多>>摘要：Deriving atmospheric parameters of a large sample of stars is of vital importance to understand the formation and evolution of the Milky Way.Photometric surveys,especially those with near-ultraviolet filters,can offer accurate measurements of stellar parameters,with the precision comparable to that from low/medium resolution spectroscopy.In this study,we explore the capability of measuring stellar atmospheric parameters from Chinese Space Station Telescope(CSST)broad-band photometry(particularly in the near-ultraviolet bands),based on synthetic colors derived from model spectra.We find that colors from the optical and near-ultraviolet filter systems adopted by CSST show significant sensitivities to the stellar atmospheric parameters,especially the metallicity.According to our mock data tests,the precision of the photometric metallicity is quite high,with typical values of 0.17 and 0.20 dex for dwarf and giant stars,respectively.The precision of the effective temperature estimated from broad-band colors are within 50 K.
      原文链接:
    • 万方数据
    • 维普

    Weak Merging Scenario of CLASH Cluster A209

    Wen-Cheng FengHeng YuHai-Hui ZhaoXiao-Lan Hou...
    174-182页
    查看更多>>摘要：We study the structural and dynamical properties of A209 based on Chandra and XMM-Newton observations.We obtain detailed temperature,pressure,and entropy maps with the contour binning method,and find a hot region in the NW direction.The X-ray brightness residual map and corresponding temperature profiles reveal a possible shock front in the NW direction and a cold front feature in the SE direction.Combined with the galaxy luminosity density map we propose a weak merger scenario.A young sub-cluster passing from the SE to NW direction could explain the optical subpeak,the intracluster medium temperature map,the X-ray surface brightness excess,and the X-ray peak offset together.
      原文链接:
    • 万方数据
    • 维普

    Prospects of the Multi-channel Photometric Survey Telescope in the Cosmological Application of Type Ⅰa Supernovae

    Zhenyu WangJujia ZhangXinzhong ErJinming Bai...
    183-191页
    查看更多>>摘要：The Multi-channel Photometric Survey Telescope(Mephisto)is a real-time,three-color photometric system designed to capture the color evolution of stars and transients accurately.This telescope system can be crucial in cosmological distance measurements of low-redshift(low-z,z(≲)0.1)Type Ⅰa supemovae(SNe Ia).To optimize the capabilities of this instrument,we perform a comprehensive simulation study before its official operation is scheduled to start.By considering the impact of atmospheric extinction,weather conditions,and the lunar phase at the observing site involving the instrumental features,we simulate light curves of SNe Ia obtained by Mephisto.The best strategy in the case of SN Ia cosmology is to take the image at an exposure time of 130 s with a cadence of 3 days.In this condition,Mephisto can obtain hundreds of high-quality SNe Ia to achieve a distance measurement better than 4.5％.Given the on-time spectral classification and monitoring of the Lijiang 2.4 m Telescope at the same observatory,Mephisto,in the whole operation,can significantly enrich the well-calibrated sample of supemovae at low-z and improve the calibration accuracy of high-z SNe Ia.
      原文链接:
    • 万方数据

    BSN:Photometric Light Curve Analysis of Two Contact Binary Systems LS Del and V997 Cyg

    Atila PoroMehmet TanriverElham SarvariShayan Zavvarei...
    192-213页
    查看更多>>摘要：The light curve analyses and orbital period variations for two contact binary stars,LS Del and V997 Cyg,are presented in this work which was conducted in the frame of the Binary Systems of South and North project.Ground-based photometric observations were performed at two observatories in France.We used the Transiting Exoplanet Survey Satellite(TESS)data for extracting times of minima and light curve analysis of the target systems.The O-C diagram for both systems displays a parabolic trend.LS Del and V997 Cyg's orbital periods are increasing at rates of dP/dt=7.20× 10-08 daysyr-1 and dP/dt=2.54 × 10-08 days yr-1,respectively.Therefore,it can be concluded that mass is being transferred from the less massive star to the more massive component with a rate of dM/dt=-1.96 × 10-7M⊙ yr-1 for the LS Del system,and dM/dt=-3.83 × 10-7M⊙yr-1 for V997 Cyg.The parameters of a third possible object in the system are also considered.The PHysics Of Eclipsing BinariEs Python code was used to analyze the light curves.The light curve solutions needed a cold starspot due to the asymmetry in the LS Del system's light curve maxima.The mass ratio,fill-out factor,and star temperature all indicate that both systems are contact binary types in this investigation.Two methods were applied to estimate the absolute parameters of the systems:one method relied on the parallax of Gaia DR3,and the other used a P-M relationship.The positions of the systems are also depicted on the M-L,M-R,q-Lratio,and log Mtot-logJ0 diagrams.We recommend that further observations and investigations be done on the existence of a fourth body in this system.
      原文链接:
    • 万方数据
    • 维普

    Lossless Compression Method for the Magnetic and Helioseismic Imager(MHI)Payload

    Li-Yue TongJia-Ben LinYuan-Yong DengKai-Fan Ji...
    214-221页
    查看更多>>摘要：The Solar Polar-orbit Observatory(SPO),proposed by Chinese scientists,is designed to observe the solar polar regions in an unprecedented way with a spacecraft traveling in a large solar inclination angle and a small ellipticity.However,one of the most significant challenges lies in ultra-long-distance data transmission,particularly for the Magnetic and Helioseismic Imager(MHI),which is the most important payload and generates the largest volume of data in SPO.In this paper,we propose a tailored lossless data compression method based on the measurement mode and characteristics of MHI data.The background out of the solar disk is removed to decrease the pixel number of an image under compression.Multiple predictive coding methods are combined to eliminate the redundancy utilizing the correlation(space,spectrum,and polarization)in data set,improving the compression ratio.Experimental results demonstrate that our method achieves an average compression ratio of 3.67.The compression time is also less than the general observation period.The method exhibits strong feasibility and can be easily adapted to MHI.
      原文链接:
    • 万方数据
    • 维普

    Morphological Classification of Infrared Galaxies Based on WISE

    Zhi-Ren PanBo QiuCui-Xiang LiuA-Li Luo...
    222-236页
    查看更多>>摘要：This study introduces a novel convolutional neural network,the WISE Galaxy Classification Network(WGC),for classifying spiral and elliptical galaxies using Wide-field Infrared Survey Explorer(WISE)images.WGC attains an accuracy of 89.03％,surpassing the combined use of K-means or SVM with the Color-Color method in more accurately identifying galaxy morphologies.The enhanced variant,WGC_mag,integrates magnitude parameters with image features,further boosting the accuracy to 89.89％.The research also delves into the criteria for galaxy classification,discovering that WGC primarily categorizes dust-rich images as elliptical galaxies,corresponding to their lower star formation rates,and classifies less dusty images as spiral galaxies.The paper explores the consistency and complementarity of WISE infrared images with SDSS optical images in galaxy morphology classification.The SDSS Galaxy Classification Network(SGC),trained on SDSS images,achieved an accuracy of 94.64％.The accuracy reached 99.30％when predictions from SGC and WGC were consistent.Leveraging the complementarity of features in WISE and SDSS images,a novel variant of a classifier,namely the Multi-band Galaxy Morphology Integrated Classifier,has been developed.This classifier elevates the overall prediction accuracy to 95.39％.Lastly,the versatility of WGC was validated in other data sets.On the HyperLEDA data set,the distinction between elliptical galaxies and Sc,Scd and Sd spiral galaxies was most pronounced,achieving an accuracy of 90％,surpassing the classification results of the Galaxy Zoo 2 labeled WISE data set.This research not only demonstrates the effectiveness of WISE images in galaxy morphology classification but also represents an attempt to integrate multi-band astronomical data to enhance understanding of galaxy structures and evolution.
      原文链接:
    • 万方数据
    • 维普