查看: 81354|回复: 562
打印 上一主题 下一主题

研究:距离65光年的超热“超级地球”系外行星可能没有大气层_我的网站

[复制链接]
跳转到指定楼层
楼主

机械师

研究:距离65光年的超热“超级地球”系外行星可能没有大气层_我的网站

刀马旦

A |     

Inflation showed its sticky nature in July, rising slightly as increases in services costs offset a decline in the price of goods, the Bureau of Economic Analysis reported on Thursday.
The personal consumption expenditures price index, a metric closely followed by the Federal Reserve, rose 0.2% for the month and 3.3% for the 12-month period. That was in line with estimates.
The core index, stripping out energy and food costs, rose 0.2% and 4.2%, respectively. Last month, the annual rate of increase was 3% and 4.1%.
Other data in the release showed spending and income up.
“Condition of the American consumer remains rock solid,” RSM US LLP Principal & Chief Economist Joseph Brusuelas posted on X, formerly Twitter. He noted that spending was up 0.8%, inflation-adjusted spending was up 0.6% and 2.8% on a three-month annualized pace – placing some risk on the company’s 2.1% forecast for gross domestic product growth in the third quarter. He also pointed out that income was up 0.2%, while wages, salaries and compensation were up 0.4%.”
While the PCE number is perhaps higher than the Fed would like, Chairman Jerome Powell said in his recent speech at the central bank’s summer symposium at Jackson Hole, Wyoming, noted that “on a 12-month basis, core PCE inflation peaked at 5.4 percent in February 2022 and declined gradually to 4.3 percent in July.”
But he also cautioned that the path to the Fed’s 2% annual inflation target will require that interest rates remain high for some time to come.
“Turning to the outlook, although further unwinding of pandemic-related distortions should continue to put some downward pressure on inflation, restrictive monetary policy will likely play an increasingly important role,” Powell said. “Getting inflation sustainably back down to 2 percent is expected to require a period of below-trend economic growth as well as some softening in labor market conditions.”
Markets seem unfazed by the messaging. In recent days, the Dow Jones Industrial Average has been on an upward run and is positioned to open up 150 points at the opening.
“Headlines touting a soft landing are increasing, the consensus seems to be that a soft landing is the most likely scenario, this seems like a unicorn scenario, but mixed economic data makes predicting a recession difficult,” said Shana Orczyk Sissel, CEO and founder of Banrion Capital Management. “We see clear signs of broad economic weakness, but inflation is falling, employment is strong, and the consumer is spending, so it's hard to really see a recession occurring this year.”
Many economists have pointed out that getting inflation down to the 3% range from the 9% of last summer, while an accomplishment, will prove easier than wringing the last 1% out.
“While signs point to a continued slowdown in inflation over time, certain categories give us pause as we close out 2023 and head into 2024,” said Joe Davis, chief global economist at Vanguard. “The decline in house prices appears to have abated, which means that the contribution from shelter to core inflation next year may stabilize if not increase. Upside inflation risk is also present in healthcare services where insurance prices are expected to rise this October along with a continued upward pressure on labor demand in the sector, thus suggesting higher wage costs.”
“Our baseline trajectory anticipates a gradual decline in the pace of inflation with core PCE staying well above 3% through YE 2023 and remaining slightly above 2% by YE 2024,” Davis added.
。    “超级地球”是一类不同于我们太阳系中任何行星的行星。它们的质量比地球大,但不超过其质量的10倍。这意味着它们的质量比地球大,但又比海王星和天王星这样的冰冷气态巨行星轻。它们可以由气体、岩石或两者的组合组成。关键事实天文学家通常通过观察行星在经过其宿主恒星前时阻挡了多少光线来发现和研究系外行星,这种技术被称为“凌日法”。GJ 1252 b是一颗距离地球约65光年的系外行星,其半径是地球的1.18倍,于2020年被美国宇航局的凌日系外行星调查卫星(TESS)用这种方法发现。这项新研究中的天文学家在斯皮策太空望远镜退役前对这颗系外行星进行了观测,并能够近距离观察这颗行星和它的大气。利用斯皮策望远镜,研究小组检测到了次蚀。这发生在一颗行星经过一颗恒星后面时,行星的光线被阻挡。行星的光线来自于其自身的红外辐射(或热量),以及从恒星反射的光线。寻找宇宙中生命迹象的天文学家们关注系外行星的一些不同细节。这些细节中有许多是系外行星和地球之间的比较,因为地球仍然是我们已经确认存在生命的唯一行星。GJ 1252 b并不比地球大多少。

B | 然而,它的温度要高得多,因为它离它的恒星更近。此外,正如天文学家在这项研究中发现的那样,它缺乏很多大气层。

C | 天文学家和研究报告的共同作者、马克斯-普朗克天文研究所系外行星大气物理学部主任Laura Kreidberg说:“我们刚刚开始了解岩质行星能够保持其大气层的频率,以及在什么情况下。

D | 这一测量结果表明,对于最热的行星,厚厚的大气层通常不太可能存在。”为了确定这颗系外行星的大气层(如果有的话)可能是什么样的,天文学家测量了GJ 1252 b的红外辐射,因为它的光线在一次次的日食中被遮挡。

E | 这些观测结果揭示了这颗行星炙热的白天温度,估计高达2242华氏度(1228摄氏度)。事实上,GJ 1252 b是如此之热,以至于金、银和铜都会在这颗行星上融化。这个系外行星的预期温度,与大气模型相比,表明它的表面压力可能低于10bar (作为参考,地球的表面压力约为1bar )。虽然这颗行星的炙热温度将使大气层难以长期稳定,但这颗系外行星可能有一个密度像地球的大气层,一个密度比地球高10倍的大气层,甚至没有任何大气层。鉴于其极端的温度和低的表面压力,这个团队的天文学家们预测,GJ 1252 b可能根本没有大气层。这是目前科学家对其大气层有如此清晰认识的最小的系外行星。GJ 1252b是一颗系外行星,它首先被TESS探测到,然后在2020年望远镜任务结束之前,用斯皮策望远镜进行了更彻底的调查。随着使用詹姆斯-韦伯太空望远镜(JWST)的进一步探索,研究人员可以对这颗行星的大气层进行更严格的限制,这是一种令人兴奋的可能性。

F | “当时,斯皮策是已知宇宙中唯一能够进行此类测量的设施。现在,斯皮策已被关闭,但JWST就在那里,在这些波长下,它比斯皮策要敏感得多。

G | 因此,我们用斯皮策做的困难的事情,现在我们可以开始用JWST轻松地完成,而且是对更多数量的岩质行星,”Crossfield说。“JWST的红外观测有可能揭示出像这样的热的岩石行星的表面特性。

H | 不同类型的岩石有不同的光谱特征,所以我们有可能了解到GJ 1252b是由什么类型的岩石构成的,”Kreidberg补充说。用JWST进一步研究GJ 1252 b对科学家来说是一种令人兴奋的可能性,因为确认这样一颗小而热的系外行星上有大气层是非常有趣的,因为探索像这样一颗完全没有大气层的行星的组成也是非常迷人的。由Crossfield领导的堪萨斯大学的一个小组领导了这项研究,发现了关于GJ 1252b大气层的奇怪的新细节。

I | 这项研究发表在《天体物理学杂志通讯》上。

Current article:http://sae.ganweilingmukuai.shop/vh7bp4/40qt04v.html

Published on:00:00:00


点击获取礼包
沙发
发表于 00:00:00 | 只看该作者
重庆森林 夜市人生 微博
板凳
发表于 00:00:00 | 只看该作者
醉玲珑 机械师 楚乔传
地板
发表于 00:00:00 | 只看该作者
古墓丽影 上门女婿 三生三世十里桃花
5#
发表于 00:00:00 | 只看该作者
天下无双 百思不得姐 十二生肖
6#
发表于 00:00:00 | 只看该作者
笑傲江湖 无心法师 新唐
7#
发表于 00:00:00 | 只看该作者
斯巴达克斯第三季 秦时丽人明月心 战狼
8#
发表于 00:00:00 | 只看该作者
田径女神走红 缝纫机乐队 名下多出15台车
9#
发表于 00:00:00 | 只看该作者
女生名叫黄蒲军校 真女神转生 惊声尖笑
您需要登录后才可以回帖 登录 | 立即注册

本版积分规则

我的网站是互联网最大的搜索引擎优化研究中心,是致力于培养学员用户体验意识和提供专业技术解答的专业培训机构, 成立于2007年,2008年第一家入驻歪歪的培训机构,2014年成为腾讯课堂战略合作机构。
© 2007-2016 我的网站 湘ICP备13004652号-1 Powered by Discuz!X Template by 我的网站 
快速回复 返回顶部 返回列表