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距離地球僅12.5光年之外發現兩顆類地行星

分類:科技云 瀏覽數:13 2019-06-26 14:28 IT之家 奇點/實習 編輯: 厚學

IT之家6月24日消息 搜尋地外生命研究又傳喜訊!據美國《新聞周刊》網站近日報道,一個國際天文學家團隊發現,兩顆類地行星繞著距地球僅12.5光年遠的一顆恒星運行,且位于恒星的宜居帶內,這意味著行星表面存在液態水,可能適合生命生存。

這是自2016年以來,科學家們在地球周圍發現的第10顆和第11顆系外行星。該項研究發表于最新一期《天文學和天體物理學》雜志。

來自德國哥廷根大學、西班牙加那利群島研究所(IAC)等機構的研究人員稱,這兩顆行星繞著白羊座中名為Teegarden的恒星運行。Teegarden是一顆紅矮星(一種小而相對較冷的恒星),質量只有太陽的1/10,表面溫度為2704℃。盡管它離地球較近——是距離地球第24近的恒星系統,但由于它很昏暗,科學家們直到2003年才發現它的存在。

該研究團隊在經過長達3年的持續觀測之后,最近發現Teegarden附近至少有兩顆宜居行星。研究第一作者、哥廷根大學天體物理研究所的馬蒂亞斯·策希邁斯特說:“我們測量了恒星的速度,發現它會周期性地擺動,我們確信,這些擾動由行星的引力引起。”

他們收集的數據表明,這是兩顆比地球略大的行星,在蒂加登的宜居區運行,意味著這兩顆行星表面存在液態水,因而有可能存在生命。此外,研究人員提出,這兩個被稱為B和C的行星可能是一個更大系統的一部分。

策希邁斯特說:“Teegarden很小且冷,其釋放出的能量僅為太陽的0.1%。行星B接收到的熱量幾乎與地球接受到的來自太陽的熱量相同;而行星C接收的熱量較少,使其更接近火星。”

策希邁斯特表示,這兩顆行星與恒星的距離以及行星的質量都表明,它們可能適合生命生存,但行星的半徑仍是未知數。“借助半徑,人們可以得出有關其大氣層和化學成分的信息,但這需要下一代望遠鏡才能測得。”

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